68 



CRUCIFER^. [Lepidium. 



teatl, pedicellati, albi, interdum atro-purpiireo-reticulati. — Genus satis distinctum, defectu dissepiment!, funi- 

 cuUs elongatis, glandularum absentia, staminibus subsequalibus. Affine Eutremati R. Brown, at uti nobis 

 Tidetur, satis ab illo recedens." 



Hab. Among loose stones, on the high alpine mountains of the Island of Unalaschka. Chamisso. 



26. PLATYSPERMUM. Nov, Gen, 



Silicula ovalis, dorso compressa, plana, stigmate sessili. Semina pauca, latissirne mar- 

 ginata. Cofj/ledones incumbentes. — Herbae parvce^ annum. Folia radicalia. Scapi 

 nurnerosi, uniflorL 



1. P, scapigerum. (Tab. XVIII. B.) 



Radix annua, parva, subfusiformis, parce fibrosa. Folia omnia radicalia, patentia, subruncinato-pinnatifida, 

 lobis plerumque acutis, infeme sensim minoribus, in petiolum attenuata, subcarnosa, glabra. Scapi plurimi 



eadem radice, dlgitales, erecti, simpUces, glaberrimi, semper uniflori. Flos parvus, erectus. Cal. e 

 sepalis quatuor ovalibus, concavis, glabris. Petala oblongo-obovata, alba, vix unguiculata, calyce paulo lon- 

 giora. iS'ifam. 4-, tetradynama : Fi7«menfa filiformia, edentula : ^H^Aer^ parvae, subrotundatse, flav£e. Pistil- 



r 



htm: Germen ellipticura, tereti-compressum, stigmate bilobo terminatum. Silicula exacte ovalis, sessilis, 

 piano- compressa, bilocularis; dissepimento completo; loculis subtetraspermis, Semina (vix matura) subro- 

 tunda, parva, margine membranaceo, albo, latissimo cincta. Podospermum longiusculum, gracile. Embryo : 

 Cotyledones plano-convexae, incumbentes. 



Hab. Moist rocks and in shallow soil at the Great Falls of the Columbia. Douglas, Fl. March, April. — 

 This highly interesting plant cannot he compared with any genus with which I am acquainted. The general 

 appearance of its silicula is indeed similar to that oiDraba; but the seeds and embryo are widely different, 

 while the single-flowered scapes are, as far as I know, an anomaly among Cruciferous plants. 



Tab. XVIII. B. Plant -.—naferaZ s/ze. Fig. 1, Flower; Jig. 2, Petal; Jig. 3, Stamen; Jig. 4, Pistil; Jig, 

 5, Silicula; Jig. 6, Do. with a valve partially removed; Jig. 7, Seed; Jig. 8, Embryo: — mognijied. 



Trib. VI. Lepidine^, seu Notorhizeae Angustiseptae. Silicula septo angustissimo^ valvis 

 carinatis aut valde concavis, Semina in loculis solitaria aut pauca, ovata^ immarginata, 

 Cotyledones plancB incumbentes {nisi in Lepidiis quibusdain,) septo parallels. DC, 



27. LEPIDIUM. Zinn. 



Silicula ovata aut subcordata, valvis carinatis aut rarius ventricosis, dehiscentibus, 

 loculis I-spermis. Semina subtriquetra aut compressa. [Cotyledones nonnunquam accum- 

 bentes.) — Flores olbL DC, 



1. L. ruderaU; floribus diandris apetalis, foliis radicalibus caullnis pinnatifidis Incisisve 

 rameis linearibus integerrimisj siliculis (parvis) lato-ovalibus emarginatis patentibus, coty- 

 ledonibus incunibentibus.— Zfw». Sp, PL p, 898. Engl Bot, t 1595. De Cand, Prodr. v, 1. 

 p. 205. Rich, in FranhL \st Journ, ed, 2, App, p, 2T. 



Hab. From Hudson's Bay to the Pacific, and from lat. 50° to 68° ; in waste places. Dr. Richardson; 

 Drummond; Scouler; Douglas, — The leaves, even the lower ones, are more incised than pinnatifid, in which 

 respect alone they differ from the Engl. Bot. figure, and from that in Fl. Dan. t. 184. Stems upright, a foot 

 high, much branched. Petals none. Silicults small. Cotyledons decidedly incumbent. 



2. L, Menziesii; floribus diandris apetalis, foliis radicalibus bipinnatifidis, caulinis 

 rameisque plurimis pinnatifidis, supremis linearibus integerrimis. 



