112 CRUCIFERiE. Platyspermdm. 



28. EUTREMA. R. Br. in Parry's Ut voy. upp. p. 267 ; Hook. fl. 

 Bor.-Am. 1. p. 67. t. 24. 



'Silicle (or rather silique) ancipital ; valves carinate : septum (in E. Ed- 

 wardsii) incomplete. Seeds not margined. — Perennial herbs, with the habis. 

 of Braya and Platypetalum. 



1. E. Edwardsii (R. Brown) : silicles lanceolate ; septum obliterated ; 

 leaves ovate-lanceolate, on long petioles. Hook. I. c. — R. Br. I. c. t. A. 



Arctic America! — Stem 2-4 inches high (in fruit sometimes a foot high 

 Hook.), simple, few-leaved. Leaves entire. Petals white. Silicle 3-4 lines 

 long ; cells about 4-seeded : style almost none : stigma somewhat lobed. 

 R. Br. 



2. E. arenicola (Richards.): silicles broadly linear; septum complete; 

 leaves spatulate-oblong. Hook. fl. Bor.-Am. .1. p. 67. i. 24. 



Arctic America, in deep sand, Richardson. — Caudex divided under the 

 sand into many branches, each of which bears a dense tuft of leaves at the 

 crown. Leaves on long petioles. Scape 2-3 inches high, someAvhat leafy. 

 Petals white. Silicle 6-8 lines long : septum marked with an obscure 

 longitudinal line in the middle. — Hook. 



29. APHRAGMUS. Andrzejowski, in DC.prodr. 1. p. 209. 



Oreas, Cham tf- Schlecht. in Linnma, 1. ]). 29. t- 1- 



Silicle lanceolate, compressed ; valves plane, marked with a median line : 

 septum none. Style very short : stigma capitate. Seeds many, oval, sus- 

 pended on elongated funiculi from the upper part of the placentse. — A small 

 perennial herb, with the habit of Cardamine beUidifolia. — Character from 

 Cham. (^ Schlecht. 



We have scarce a doubt that Apliragmus, Andrz. and Oreas, Cham. <^ Schlecht. 

 are founded upon the same plant, and hence we venture to adopt the prior name. 

 The following comprises all that is recorded concerning Andrzejowski's plant : 

 " Silicula acuta, valvis plants nervosis, septo nulla, semina 2-seriata ycndula, cotyle- 

 doncs incumbcntes crassiE. — In insulis Ahutianis." Andrz. in litt. (Z?C. I. c) De 

 Candolle places it in Isatidcse, but asks (very properly) if it does not rather belong 

 to Camelineaj. 



A. Eschscholtzianus (Andrz. 1. c.) — Oreas involucrata, Cham.^ Schlecht. 

 I. c. ; Hook. fl. Bor.-Am. 1. p. 67. 



Among loose stones on the Alpine mountains of the Island of Unalaschka. 

 Root [rhizoma?] filiform, branching, concealed among stones ; the branches 

 bearing tufts of leaves at the extremity. Scapes i an inch to 2 inches high. 

 Radical leaves on long petioles, spatulate, entire. Flowers (and fruit) corym- 

 bose, white, with large lanceolate or spatulate bracts at the base of the pedi- 

 cels. Silicle 4-6 lines long, li line broad, 4-10-seeded. Funiculi and seeds 

 persistent long after the falling of the valves. Cotyledons [ex icon.] very thick. 

 Cham. (§• Schlecht. 



30. PLAT YSPERMUM. Hook. fl. Bor.-Am. 1. p. 68. 1. 18. / B. 



Silicle oval, compressed ; valves plane. Stigma sessile. Seeds few, with 

 a broad margin. — A small annual herb. Leaves radical. Scapes 1-flowered. 



