Platypetalum. CRUCIFERiE. Ill 



2. C. barbareaifolia (DC.) : silicles globose; stigma capitate ; leaves ob- 

 long, piniiatifid, obtusely auricled at the base ; stem villous below. DC. syst. 

 2. p. 5 IT); Dcles-s. ic. 2. t.70; Cham. ^ Schlecht. in Linncea, 1. /). 29 ; 

 Hook.Jl. Bnr.-Am. \. p. 65. 



Bay of Eschscholtz, N. W. America, Chamisso. — 11 Habit of Nastur- 

 tium ampliibium. 



26. BRAYA. Sternb. <^ Hoppe ; DC. syst. ; Hook, cxot.fi. 1. t. 121. 



Silicle (or rather silique) oblong, terete, torulose. Style short or none. 

 Septum cleft in the middle. Seeds about 6 in each cell. Calyx equal at the 

 base, erect. — Perennial herbs, with thick long descending roots. Leaves 

 mostly radical, narrow. Scapes short. Flowers small, white or pale purple. 



We follow Hooker in placing Uiis and the following genera in Camelineae ; but 

 are not satisfied that this is their proper station. 



1. B. aJpina (Sternb. & Hoppe) : leaves glabrous ; scapes sparsely leafy; 

 racemes capitate in fruit. Hook. — DC. prodr. 1. p. 141 ; Deless. ic. 2. t. 2§; 

 Ilook. fi. Bor.-Am. 1. p. 65. 



/?. Americana (Hook. 1. c.) : style rather long, slender. 



Rocky Mountains, lat. 52°-57°. (var. B.) — Leaves'linear-spatulate, entire. 



2. B. glabella (Richards.) : leaves glabrous ; scapes mostly leafy ; ra- 

 cemes elongated in fruit, loose. Hook. — Richards, app. Frankl. journ. p. 

 25; DC: prodr. 1. p. 141 ; Hook. ft. Bor.-Am. 1. p. 65. 



Arctic America, i?icAarrfso?i. — V, Scape sometimes hairy. Flowers most- 

 ly white. Hook. 



3. B.? pilosa (Hook.) : leaves pilose ; scapes leafless ; racemes elongated 

 in fruit. Hook. ! fl. Bor.-Am. l.p. 65. t. 17. 



Arctic Sea at the mouth of Mackenzie River, Richardson ! — 11 Leaves 

 much crowded, linear-lanceolate. Scape 2-3 inches high. Silicle (imma- 

 ture) oval hairy; cells 8-seeded. Mature fruit not seen. — Probably a dis- 

 tinct genus. 



27. PLATYPETALUM. R. Br. in Pam/s 1st voy. app. p. 266. 



Silicle oval, compressed, many-seeded ; valves convex. Style very short. 

 Calyx somewhat spreading. Limb of the petals dilated. — Habit of Braya, 

 but differing in the fruit. 



1. P. purpurascens (R. BroAvn) : stigma with 2 spreading lobes ; style 

 distinct; scapes naked or with a single leaf; silicles nearly glabrous. R. Br. 

 I. c. ; Hook. ! fi. Bor.-Am. 1. p. 66. t. 23. I3raya arctica, Hook, in Parry^s 

 2nd voy. app. p. 3S7. 



Arctic America! from Mackenzie River to Spitzbergen. — 11 Scapes 

 several from one root, in flower scarcely an inch high. Leaves lanceolate, 

 mostly entire. Petals white, tinged with purple (i?. Br.) : lamina broader 

 than long, very obtuse. Silicles in long racemes, about one-third of an inch 

 in length ; cells about 8-seeded. Septum complete, thin: areolae transverse. 

 Seeds not margined. 



2. P. dubium (R. Brown) : stigma undivided, nearly sessile ; silicles and 

 scapes pubescent. R. Br. I. c. 



Melville Island. — Flowers not seen. R. Br. 



