BEN |
BOTANICAL ELECTRONIC NEWS |
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ISSN 1188-603X |
No. 381 September 12, 2007 | aceska@telus.net | Victoria, B.C. |
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This year's Botany BC was held in Osoyoos, from 10-13 May. Headquarters was the Spirit Ridge Resort and the adjacent Nk'Mip Desert Cultural Centre. Elizabeth Easton masterminded all the planning with her customary skill, she and Terry McIntosh were our hosts.
The weather was warm and the sun shone on our two field-trip days, when we split into two groups, each spending a day on each trip.
Trip 1. The first part of Trip 1 was led by Mike Miller, and took us up open hillsides overlooking the Similkameen River near Chopaka in the morning. The second part of Trip 1, led by Adolf and Oluna Ceska, took us along the road up Mt Kobau almost to the summit, where germinating Floerkea proserpinacoides and some last year's stalks of Agastache urticifolia were found. When we reached the snow close to the top on Mt. Kobau, Jim Ginns and Oluna Ceska showed us some very interesting snow bank fungi (cf. BEN # 377 April 12, 2007), including Caloscypha fulgens, Cheilymenia fimicola (on old cow dung), Cheilymenia raripila (on cow dung), Clitocybe albirrhiza, Clitocybe glacialis, Discina perlata, Erythricium laetum (comon snow bank mushroom in WA, not previously collected in British Columbia), and Peziza sp.
Trip 2, led by Terry McIntosh, went to exceedingly dry benchlands (cactus and tumbleweed country) east of Highway 27 between Osoyoos and Oliver in the morning; and in the afternoon, to the foot of McIntyre Bluff (overlooking Vaseux Lake) and on to White Lake Grasslands and Haynes Lease. The botanizing was splendid. The low-altitude bench lands of the Okanagan Valley are typically covered with sage-brush (Artemisia tridentata), rabbit-brush (Ericameria nauseosa), and bluebunch-wheatgrass (Psudoroegneria spicata), plus a multitude of attractive flowering herbs. Those in flower included Erigeron linearis, Lithospermum incisum, Hydrophyllum capitatum, Triteleia grandiflora, Calochortus macrocarpus, Lewisia rediviva and Balsamorrhiza sagittata. Mike was also able to show us red- listed Linanthus septentrionalis and blue-listed Halimolobus whitedii.
The very southern end of the valley, including Osoyoos, has abundant antelope-brush (Purshia tridentata) as well as sage- brush which, because it is so much darker, makes for a marked change in the scenery. And with the antelope-brush we saw some of the plants whose range in Canada is restricted to the extreme southern end of the Okanagan valley, such as Artemisia tripartita, Halimolobus whitedii, Erigeron poliospermus and Leptodactylon pungens. These are some of the plants species that give the region its exceptional biodiversity. Other rarities seen by some of our group were two blue-listed snakes: western rattlesnake (Crotalus oreganus) and racer (Coluber costrictor). They all need the protection that only the planned South Okanagan-Similkameen National Park can provide and that is still not a fait accompli. We must write more letters to the Prime Minister and Minister of the Environment (from the informed to the ignorant) to reinforce the letters we sent last year.
Besides the field trips we had two interesting and convivial evenings at the magnificent Nk'Mp Desert Cultural Centre. We were welcomed on our first evening by Modesta Stelkia Betterton and Chief Clarence Louie and watched the fascinating film "Coyote Spirit." During the evening we were also treated to the exquisite details of nature with its wondrous geometry via a slide show set to music. Orville Dyer's photography captured the form, light and beauty that surrounds us when we open our eyes and examine the intricacies of our earth. Ted Lea illustrated the use of historical mapping in determining eco-system modification and shifting dynamics by comparing historical photographs, with identifiable landmarks, to present day photographs. Knowledge of the historical context of the earlier photographs is relevant because early settlement was accompanied by practices that changed the environment significantly from pre-contact land use.
On our final evening, following a feast of salmon cooked traditionally over a bonfire, the Osoyoos Indian Band Youth Dancers engaged the audience with traditional dancing. Participation by the very young children guided by older teenagers illustrated how cultural inclusiveness is valued in traditional learning. The youngest Botany BC members joined the dancers with energy and joy. Terry Millar presented an entertaining overview of activities in the South Okanagan. For the first time Botany BC honoured the substantial contribution of Oluna and Adolf Ceska to the study of botany. All of us have benefited from the years of dedication, research and botanical support of these remarkable botanists. An entertaining slide show compiled by the Botany BC committee highlighted their achievements. Oluna and Adolf were invited to choose the next location for Botany BC, but they preferred to leave the decision to the whole group.
That was Botany BC in 2007-memorable for the beautiful landscapes, flora and fauna. Thank you Elizabeth, Terry, Adolf, Oluna and Mike for organizing this great trip. For Botany 2008, we'll meet at Powell River and plan to visit Savary and Texada Islands.
[It was a pity that for quite a few of us our nice memories of BOTANY BC 2007 were marred by a fierce attack of Norwalk virus (Norovirus) that troubled about 40 per cent of participants. Let's hope that all of those afflicted will remember the nice botanical moments rather than the negative side of the trip. - AC]
This is the first comprehensive work on Colorado bryophytes, 401 mosses and 106 liverworts and hornworts, compared to 292 (mosses only) reported in Weber (1973) Guide to the Mosses of Colorado. This is the result of a decade of concentrated field and herbarium work, not to mention over 75 years preparatory studies by the senior author and 20 by the junior.
Colorado has been a blind spot in the map of North American bryophytes, and while it has no known endemic species, there are a significant number that are disjunct from the Holarctic region, Middle Asia including western China, the Russian Altai, Turkestan, and Central and South America.
The book comprises an introduction outlining the history of bryological collecting, explanation of the scientific names, notes on the people who described the species, keys to the genera and species, citations of significant specimens, a glossary, index by specific epithets, bibliography, and an alphabetical catalog with lists of synonyms that have been applied in earlier papers.
Since this is a fairly technical book, we now are beginning to refine our electronic Moss Primer to help beginners to become acquainted with the easily recognizable common species of Colorado.
Euphorbia esula is a major weed of both agriculture and natural landscapes in Canada (Biesboer and Eckardt 1987, Haber 1997). Especially in the prairie provinces it interferes with agricultural production costing millions in reduced carrying capacity of rangeland, and it also displaces many native species and changes natural habitats. Recently we have received many questions regarding its identification and relationship to other species found in Eurasia and possibly occurring in North America.
Development of a database of specimens in Canadian herbaria at DAO required checking of specimen identifications and the following notes were prepared as part of this process. These notes, reproduced below, will satisfy many of the requests for information that we have received, especially regarding identification. Comments and new information are welcome.
Leafy Spurge is native to Eurasia where it was once divided into numerous species by taxonomists in different countries. In fact more than 60 species have been described in the aggregate. Recent studies have suggested several related species in the group and the recent Canadian study of Crompton et al. (1990) suggested that four taxa occur in North America E. agraria Bieb., E. cyparrisias L., E. esula L., and the hybrid E. X pseudoesula Schur. The group of E. esula and its close relatives (within section Esula Dumort.) is distinguished by smooth seeds, raylet leaves not joined at the base, capsules 4-5 mm wide, and leaves pinnately veined (Smith & Tutin 1968). The group is probably best conceived as about 7 species (E. agraria, cyparissias, esula, lucida, nevadensis, salicifolia, and undulata). There are also 3 hybrids and E. boissieriana, the relationships of which are unclear.
The last extensive taxonomic study of the group was that of Crompton et al. published in 1990. It contributed some important observations, but much more detailed taxomomic work is needed in this difficult group. Although useful, recent studies have been localized (e.g. Geltman 1996) or general (e.g. Rowe 1997). It is remarkable that the last time substantial taxonomic work was done on this complex, was 17 years ago, yet the need is clear and it is one of the world's worst weeds.
Much information has been published on biology, control and impact, both in the scientific and popular literature and on the web (e.g. Best et al. 1980, Haber 1997). Its expansion in Canada occurred mostly after 1933 (see maps in Haber 1997). It continues to invade, at least on a local scale, and has a number of effective seed dispersal mechanisms. Seeds lodge in mud on vehicles and are dispersed by a variety of animals (e.g. Blockstein et al. 1987; Pemberton 1988; Wald et al. 2005). Root- feeding Flea Beetles, including 5 species of Apthona, most of which are established across Canada, have proven effective in biological control reducing some infestations by 90%. Since the cost of spraying herbicide to achieve control is excessive, these beetles may already have saved many millions. Another control agent, the Spurge Hawk Moth (Hyles euphorbiae) has proven to be a useful control agent as a larvae (e.g., Forward,and McCarty. 1980) but may also be beneficial as an adult in pollinating an endangered native orchid (Jordan et al. 2006). It may also be of interest that milky juice of leafy spurge causes a severe dermatitis in some people and the plants are poisonous to most livestock.
Annotated list of species occurring in Eurasia, Canada, and the United States (species not reported from Canada are in square brackets, the list includes partial synonymy largely from Smith & Tutin (1968) and Govaerts et al. (2000). A complete list of synonyms and their places of publication may be found in the latter reference.
Widesrpead in southeastern Europe, introduced in North America. In Canada known only from Alberta, where collected at Edgerton and Lonely Lake on the Bow River, Alberta (Crompton et al. 1990). It is also known from the midwestern and notheastern U.S (Kartesz & Meachum 1999). A few varieties requiring more study have been described on the basis of leaf shape (Smith & Tutin 1968).
Although sometimes considered a synonym of E. esula (e.g. Davis 1982), this taxon was recognized as a species by Govaerts et al. (2000) and Stace et al. (2005). This latter species (and its putative hybrid with E. esula) are separated from subsp. tommasiniana by their slightly wider and more acuminate leaves (Stace et al.2005).
There are both diploid and tetraploid races in North America and Europe, but in Ontario some of the diploid plants lack viable pollen (Moore & Frankton 1969).
Having examined hundreds of specimens from across Canada, it is
concluded that infrataxa should not be recognized as suggested by
some recent authors (Crompton et al. 1999, Evans et al. 1991). A
single plant may often possess characters of both subspecies (see
below). For example an individual plant may have both linear
acute and oblanceolate obtuse leaves. Furthermore leaf shape and
width appears to vary continuously among individuals and has a
normal distribution. The number of rays is at least to some
extent related to plant size. Two subspecies have been segregated
using the following characters. Notes on these follow the key.
(1) subsp. esula, LEAFY SPURGE, WOLF'S-MILK
(E. borodinii Sambuk, E. filicina Portenschl,
E. imperfoliata Vis., E. intercedens Podp., E.
pancicii G. Beck, E. pseudoagraria Smirnov, E.
pseudovirgata (Schur) Soo, Galarhoeus esula (L.)
Rydb., Tithymalus esula (L.) Hill
Plants of E. esula with lanceolate instead of
oblanceolate leaves have sometimes been segregated as E.
waldsteinii (e.g. Stace et al. 2005).
(2) subsp. tommasiniana (Bertol.) Kuzmanov, LEAFY SPURGE,
WOLF'S-MILK (Euphorbia esula L. var. uralensis
(Fisch. ex Link) Dorn, E. subcordata Ledeb., E.
tenuifolia Lam., E. uralensis Fisch. ex Link, E.
virgata Waldst. & Kit., non Desf., E.
waldsteinii (Soják) Radcl.-Sm., Tithymalus
uralensis (Fisch. ex Link) Prokhanov)
Although it is identified by its narrow leaves, this
character may not have been part of the original concept
(Crompton et al. 1990) so that some additional work is
required, not only to establish rank, but also to verify
the application of the name.
This taxon was reported for Canada by Stahevitch et
al. (1988) but not in a later publication involving the
same author (Crompton et al. 1990) which accounted for
all Canadian species. Thus it is presently considered
not to occur in Canada, but there are periodic
references to its occurrence in Saskatchewan based on the
report of Stahevitch et al. (e.g. Kartesz & Meachum
1999). In the U.S. it is reported from several states in
the upper midwest and in the Great Lakes region (Kartesz
& Meachum 1999).
Some European workers have recently recognized this taxon
at the rank of species (E. virgata Waldst. & Kit, e.g.
Geltman 1998). It has most recently been recognized at
the rank of subspecies (subsp. tommasiniana (Bertol.)
Kuzmanov, e.g. Govaerts et al. 2000). In North America it
has been treated at the rank of variety (Euphorbia
esula L. var. uralensis (Fisch. ex Link) Dorn,
Vascular Plants of Wyoming p. 296. 1988, Kartesz &
Meachum 1999), Recognition appears unwarranted (see
above) but if recognized, varietal rank seems most
appropriate and it is desirable to maintain the name
currently used in North America. However, it is treated
as a subspecies in the recent world list of Euphorbia
species (Govaerts et al. 2000).
Euphorbia esula L. var. orientalis Boiss. was reported
from Connecticut by Croizat (1945) under the name"E.
virgata orientalis." Croizat (1945) thought that it
belonged within E. iberica and described it as a taller
and stouter plant than E. virgata. The latter has most
recently been treated as a synonym of E. esula var.
uralensis (e.g. Smith & Tutin 1968) and var.
orientalis has has been treated as a synonym of E.
virgata (Davis 1982). Both are currently treated as
synonyms of subsp. tommasiniana (Govaerts et al. 2000).
Euphorbia waldsteinii (Soják) Radcl.-Sm., recognized as
the lanceolate-leaved member of the "esula aggregate" by
Stace et al. (2005), is treated as a synonym of subsp.
tommassiniana by Govaerts et al. (2000).
Euphorbia X gayeri Borbás & Soó, a hybrid of
E. cyparissias and E. esula subsp. tommasiniana has
been reported from from central Europe to Romania. It would
be difficult to distinguish since subsp. tommasiniana
closely resembles E. cyparissias.
Euphorbia X pseudovirgata (Shur.) Soo, a putative
hybrid of subsp. esula and ssp. tommasiniana, is treated
as a synonym of E. esula var. esula by some recent
authors but retained by Govaerts et al. (2000). It is
reported from Europe from the region of Poland to Bulgaria.
Since the subspecies intergrade, the recognition of this
hybrid seems unwarranted.
Although E. lucida was reported for Canada (at Edgerton,
Alberta by Croizat in 1945), the report was rejected by Crompton
et al. (1990) since the specimen was misidentified as E.
agraria. Boivin (1966, 1967) identified E. lucida on the basis
or cordate leaves (although he changed his key later (Boivin &
Cruise 1978). Plants with cordate leaves are now placed with E.
agraria (e.g. Smith & Tutin 1968) so Boivin's reports (and
others based on his) for both Alberta and Saskatchewan are
discounted. Boivin and Cruise (1978 ms) suggested that the
reports E. lucida for Ontario were based on a specimen at TRT
correctly assigned to E. esula. These earlier erroneous reports
may be the basis for more recent listings for the province. This
species has also been reported from three states in the
northeastern U.S. (Kartesz & Meachum 1999). It is native to
central and southeastern Europe (Smith and Tutin 1968).
A species closely related to E, agraria but smaller (leaves
less than 30 mm long instead to 80 mm). It occurs in southern
and eastern Spain.
This hybrid of E. esula var. esula and E. cyparissias, well
known in Europe. It was first reported from North America by
Moore and Frankton (1969) from the counties of Huron, Bruce and
Muskoka in Ontario. It is most easily recognized as a plant that
appears to be E. esula but has unusually numerous and crowded,
and small leaves (cauline leaves less than 4 cm long and less
than 5 mm wide). Moore and Frankton (1969) found only hybrids
between diploid E. esula and tetraploid E. cyparissias, the
hybrid having a chromosome number of 2n=50. Since two expressions
of the hybrid occur in Europe, one possibly involving a diploid
race of E. cyparissias with viable pollen, and since the
Canadian hybrids form a small amount of seed (Moore & Frankton
1969) possibly allowing backcrossing, there may yet be more
variation in this hybrid in Canada than has currently been noted.
Known in Europe from Austria to Turkey.
Key to the species of the Euphobia esula group occurring in
Canada, United States and Eurasia (Species not reported from
Canada are in square brackets). Additional taxonomic research is
needed to improve this key.
1a. Umbel with 5-9 rays; axillary rays 2-12; leaves linear to
lanceolate and acute or subacute E. esula subsp.
tommasiniana and E. X pseudovirgata and
E. X gayeri]
1b. Umbel with 8-17 rays; axillary rays 8-20; leaves oblanceolate
to broadly ovate or obovate and obtuse or emarginate
E. esula var. esula
[E. lucida Waldst. & Kit.] SHINING SPURGE, (Galarhoeus
lucidus (L.) Rydb., Tithymalus lucidus (L.) Klotzsch and Garcke]
[E. nevadensis Boiss. & Reuter]
E. X pseudoesula Schur, HYBRID CYPARISSIAS AND ESULA
(?E. X figertii Dorfler)
[E. salicifolia Host], WILLOW-LEAVED SPURGE]
[E. undulata Bieb.], UNDULATE-LEAVED SPURGE]
A native of S.E. Russia and W. Kazakhstan
1a. Leaf cordate (lobed) at the base 2
1b. Leaf base not cordate 3
2a. Leaves to 30 mm long [E. nevadensis]
2b. Leaves to 80 mm long E. agraria
3a. Plants pubescent and with ovate or ovate-lanceolate leaves
[E. salicifolia]
3b. Plants glabrous or if pubescent with linear to
linear-lanceolate leaves; 4
4a. Leaves emarginate, oblanceolate or elliptic-obovate, with
undulate margins; plants rhizomatous [E. undulata]
4b. Lacking the combination of characters in 4a,
leaves emarginate or not, oblanceolate or not, lacking
undulate margins; plants rhizomatous or not 5
5a. Leaves shiny [E. lucida]
5b. Leaves dull 6
5a. Leaves lanceolate and acuminate [E. boisseriana]
5b. Leaves linerar, lanceolate, oblanceolate, broadly ovate,
obovate, and acute or emarginate
6a. Leaves lanceolate to broadly ovate, mostly more than 4 mm
wide; lateral branches with few with scattered leaves
E. esula sensu lato (for notes on subspecies see above)
6b. Leaves linear, less than 4 mm wide; many lateral branches
with crowded leaves 7
7a. Cauline leaves less than 2.6 (3) mm wide; floral leaves
4-6 mm long E. cyparissias and [E. X gayeri]
7b. Cauline leaves more than 2.6 mm wide; floral leaves
10-13 mm long E. X pseudoesula
LITERATURE CITED
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