1. C. Canadensis; umbellis infimis ex foliorum superiorum axillis ortis, fructibus
oblongis. De Cand. Prodr. v. 4. p . 118.— Sison Canadense. Linn. Sp. PI. p. 363. Mich.
Am. v. l . p . 168. Bigel FI. Bost. ed. 2.' p. 114. Simn Canad. Lam.—Chserophyllum
Canad. Pers.—Myrrhis Canad. Moris.—Torrey, FI. o f Un. St. v. 1. p. 310— Conopo-
dium Canad. Koch.
Hab. Canada. Lake Huron and Quebec. Dr. Todd. Mrs. Percival—It is chiefly confined to the
more southern parts of Canada in British North America.*
10. SIUM. Koch.
Calycis margo 5-dentatus subinde obsoletus. Petala obovata emarginata cum lacinula
indexa. Stylopodium pulvinatum margine depressum. Styli divergenti-reflexi apice
capitulati. Fructus a latere compressus vel contractus et subdidymus,stylopodio stylisque
coronatus; mericarpia jugis æqualibus filiformibus obtusiusculis, valleculis et commissure
multmttatis. Carpophonm bipartitum, cruribus mericarpio adnatis, stylopodio pulvinato
margine depresso. Semen subteres— Herbæ plermnque aquatics. Folia pimiati-secta
segmentis ovatis oblongis dentatis aut multipartiUs. Umbellæ terminales multipartite!;
involucro polyphyUo, rarius submonophyllo. Umbellulæ multiform, mvolucello polwphullo
r lores albi. DC.
1* S‘ latif olmm / radice repente, caule sulcato-angulato, foliis pinnatisectis segmentis
ianceolatis acummatis basi inæqualibus serratis rarius pinnatifidis, involucro polyphyUo,
dentibus calycis elongatis. DC.—Linn. Sp. PL p. 361. Engl. Bot. t. 204. Bigel. FI. Bost
ed. 2. p . 111. Torrey, PI. o f Un. St. v. l .p. 311. De Cand. Prodr. v. 4. p . 124— /äJbliolii
profunde inciso-serratis.
H“ ‘ Wat“ 7 Pkces, Saskatchawan. Drummond. /3. Straits of De Fnca, North-West coast of America.
iJr. ocouler. I find it scarcely possible to distinguish some narrow-leaved states, of what I consider to be
tins plant, from the following; and I am here again much disposed to concur with Dr. Torrey in thinking
they may be only varieties of each other. The present seems to me identical with the European 8 . lati-
folium. r
2. S. lineare; caule angulato sulcato, foliis pinnatisectis segmentis 4—5-jugis lineari-
lanceolatis acute et tenuiter hinc inde serratis, involucro oligophyllo lineari. JJcWtMich.
Am. v. 1. p . 167. Pursh, FI. Am. v. 1. p. 194. Torreg, FI. o f Un. St. » .1 . p. 312. De
Cand. Prodr. v. 4. p . 125.
Had. Wifely places, Lake Huron. Dr. Todd. Canada, to the mountains and the Saskatchewan.
Drummond. Moist and oversowed grounds of the Columbia. Dr. Sander. Douglas.—The young submerged
leaves of this plant are deeply multifid or tripiuuate, with very narrow linear-subulate segments.
* ™* appears, like many other Canadian plants, to he not unfrequent about Boston, U. S__The nature of this
work only admits of my mentioning, under the respective species of plants, the names of those persons who have
favoured me with them from the British Possessions. But I am unwilling to wait till the introductany pages of this
work go to press, without expressing my acknowledgments to my valued friends, Dr. Boott of London, and B, D.
Greene, Esq. of Boston, U. S. A., for the valuable assistance rendered me in the numerous and beautifully preserved
plants they have sent me from the New England States, which, as may he expected from the vicinity of the two
countries, are intimately connected with those of Upper Canada: whilst those' from the White Mountains, sent me
by the same gentlemen, are almost identical with many from the Rocky Mountains, and from the Arctic regions.
3. S. ? Douglasii; caule tereti, foliis pinnatisectis segmentis infimis trisectis cseterisque
petiolulatis ovato-oblongis grosse serratis, umbellis oppositifoliis et terminalibus pedunculatis
exinvolucratis multiradiatis. De Cand. Prodr. v. 4. p . 125.
Hab. North-West America. Douglas.—This plant is characterised by Professor De Candolle from a
specimen gathered in the Garden of the Horticultural Society of London; and the lower leaves are said to
be a foot and a half long. May it not be a luxuriant plant of Cicuta maculata ?
' 11. BUPLEURUM. Linn.
Calycis margo obsoletus. Petala subrotunda integra arete involuta lacinula lata retusa.
Fructus a latere compressus vel subdidymus, stylopodio depresso coronatus. Mericarpia
jugis 5 alatis acutis filiformibus aut obsoletis, lateralibus marginaiibus, valleculis vittatis
aut evittatis laevibus granulatisve. Semen tereticonvexum antice planiusculum.— Herbae
aut frutices glaberrimi. Folia rarius secta scepius limbo abortivo et petiolo dilatato mutata
in phyllodia integerrima. Umbellse composite. Involucra varia. Flores flam. DC.
1. B. ranunculoides; foliis radicalibus lineari-lanceolatis, caulinis amplexicaulibus
cordato-oblongis striatis, involucro sub-3-phyllo insequali, involucelli foliolis 5 ovatis
mucronatis nervosis distinctis. DC.—Linn. Sp. PI. p. 342. De Cand. Prodr. v. 4. p. 131.
-—B. angulosum. Spreng. in Schultes, Syst. Veget. v. 6. p. 366. Hook, et Am. in Bot. of
Beech. Voy. v. 1. p. 124. Cham, et Schlecht. in Livmcea, v. 1. p. 283.
Hab. Cape Mulgrave, in Behring’s Straits. Messrs. Lay and Collie, in Captain Beechey’s Voyage.
Trib. IY. Seselineje. Fructus sectione transversali teres aut teretiusdulus aut mericar-
piis dorso subcompressis.
12. SESELI. Linn.
Calycis margo 5-dentatus, dentibus brevibus crassiusculis interdum subobliteratis. Petala
obovata, in lacinulam inflexam coarctata, emarginata, vel subintegra. Fructus ovalis vel
oblongus, sectione transversali subteres, stylis reflexis coronatus. Mericarpia jugis 5 pro-
minulis filiformibus vel elevatis crassis corticosis, lateralibus marginantibus et ssepe paulo
latioribus. Valleculcs 1-vittatae, exteriores rarius 2-vittatae. Commissura bivittata, rarius
4-vitt. Semen subsemiteres.—Herbae scepius glances, biennes aut perennes. Folia pinnati-
secta aut ternato-decomposita. Involucrum subnulluminvollucella polyphylla. Flores albi,
rarrissime flam. DC.
1. S. leiocarpum; foliis longe vaginantibus triternatis seu triternato-pinnatis, foliolis
petiolulatis oblongis integerrimis integris trifid isve glaucis, caule nudiusculo, umbellula com-
posita radiis universalibus valde inaequalibus, umbellis capitatis, floribus dioicis seu polyga-
mis? fructu (immaturo) laevissimo oblongo-cylindraceo, involucris involucellisque nullis.
(T ab. X C I I I .)
Radix? Caulis spithamseus, simplex, basi solummodo foliosus. Folia longe vaginantia, ad vaginam
usque ternata, pinnis seu foliolis primariis divergentibus, longe petiolatis, ternatis seu quinato-pinnatis; pin-
nulis sesquiuncialihus, oblongis, integris seu bi-trifidis, integerrimis, glaucis, sub lente reticulatim venosis.
Umbella solitaria (an semper?) composita; radiis valde inaequalibus; aliis vix unciam longis, alii« 3-4 poli-
caribns. Involucra involucellaque nulla. Umbellulce multiflorae, capitato-globosae, flavescentes. Flores
dioici seu polygami. Fructus (immaturus) oblongo-subcylindraceus, laevissimus, ad commisuras caiinatus.
Styli reflexi.