Cardamine.] CRUCIFERjE. 



43 



Hab. /3. Sandy and grassy places, on the shores of the Island of Unalaschka. Chamisso,—My specime 

 of this plant, communicated by Dr. Fischer from Unalaschka, seem to differ in no respect from A.petrma, 



* * 



Semina marginata^ sen ala menibranacea lata cincta, DC. 





6. A. l(BVigata; erecta, glabra, glauca, foliis radicalibus obovatis petiolatis sinuato-den- 

 tatis, caulinis linearibus sessilibus integerrimis, siliquis erectis, seminibus marginatis. 

 De Cand, Prodr. v. 1. p. 147. — Turritis laevigata. Willd. Sp. PL v, 3. p, 543. Pursh, 12. 

 Am, V, 2. p, 438. 



Hab. About Lake Huron. I>r. Todd. — A foot high. Pedicels 3-4 lines long. SiliqucB quite erect, \\ 

 to 2 inches long, linear, plane, tapering at the oxtremity into a veiy short style. 



7. A, canadensis ; erecta, glabra, foliis lanceolatis remote dentato-serratis sessilibus, 

 siliquis linearibus falcatis pendulis, seminibus lato-alatis. — Linn, Sp, PL p. 929. De Cand. 

 Prodr, V. 1. p. 147, Elliott^ CaroL v, 2. p, 148. — A. falcata. Mich. Am. v, 2. p. 31. 

 Pursky FL Am, v. 2, p, 437. 



Hab. Canada. Michaux, — In size, in habit, and in the general form of its pods, resembling our Europaeau 

 Arahis Turrita, 1-3 feet high. Seeds Avith a broad wing. This differs from A, pendula of Linn, and De 

 Candolle in wanting the auricles at the base of the leaves, and in the smooth not hispid stem. 



6. MACROPODIUM. Br. 



Siliqua linearis, pedicellata, valvis planis medio uninerviis, Semina orbiculata, com- 

 presso-plana, ala brevissima cincta. (o=.) DC, 



1. M. laciniata; foliis omnibus petiolatis laciniato-pinnatlfidis, floribus pedicellatis, 

 petal is augustis linearibus. — Hook, in Bot. Misc, v, 1. p. 341. t. 68. 



Annua. Caulis herbaceus, erectus, ramosus, glaber, 2-3-pedalis et ultra. Rami altemi, erecto-patentes. 

 Folia radicalia^ seque ac cauUna, digitalia, oblongo-lanceolata, acuta, glabra, basi in petiolura longum graci- 

 lem decurrentia, sinuato-dentata pinnatifidaque, laciniis patentibus, linearibus, integerrimis vel subdentatis : 

 summa subintegra. Racemus termiualis, elongatus, erectus, strictus, dense multiflorus. Pedicelli horizontales, 

 2 lineas longi, glabri. Calyx: sepala 4, oblonga, basi lata, erecta, membranacea, pallida. Petala 4, calyce 

 triplo longiora, patentia, linearia, alba. Stamina 6, 2 parum breviora, calyce dupio longiora. Filainenta 

 edentula. Anthers dorso prope basin affixse, lineares, siccitate recurvse, plumbese. Glandules ad basin 

 staminum 4, majusculse. Germen gracile, llneare, brevi-pedicellatum. Stylus brevis, stigmate parvo capitato 

 terminatxun. 



Hab. Common on dry rocks about Wallawallah, and at Priest's Rapid on the Columbia. Do«^/a*.— No 

 ripe fruit of this fine plant exists in the collection ; but its whole habit, its inflorescence, its calyx, petals, 

 anthers, and, above all, the pedicellated germen, indicate this to be a second species of the genus Macropo- 

 dium, of which only one was known before, the Cardami/ie nivalis of Pallas, on which 5Ir. Brown founded 

 the genus. Excellent specimens of the latter I possess, through the kindness of Dr. Fischer and Professor 

 Ledebour, from the Altai. It differs from the American plant in its perennial root, its shorter simple stems, 

 not exceeding a foot in height, its sessile flowers, shorter and more obovate petals, and shorter anthers, and 

 in the much thicker and shorter germen, with a longer pedicel, and a less divided stigma. This pedicellated 

 germen gives the plant very much the appearance of a Cleome, whence it was marked, according to Do 

 Candolle, Ckome nivalis in Vahl's Herbarium. 



7. CARDAMINE. Zinn. 



Siliqua linearis, valvis planis enerviis stepe elastice dissilientibus. Semina ovata, Im- 

 marginata, funiculi umbilicales tenues. DC, 



F 2 



