Cheiranthus. CRUCIFER^. 71 



anterior and posterior sepals, distinct or rarely connate, sometimes 

 toothed : anthers introrse. Torus with 2 or more green glands between 

 petals or stamens and the ovary. Ovary composed ot' two united car- 

 pels, with two parietal placcnttC united by a membranaceous (false) dis- 

 sepiment : style short or none, continuous, often persistent : stigmas 2, 

 opposite the placentae (anterior and posterior). Fruit (a silique or 

 silicle) usually 2.celled, rarely 1-celled, one- or many-seeded, dehiscent 

 by the separation of the valves from the persistent placentJE, some- 

 times indehiscent and either lomentaceous or nucumentaceous. Seeds 

 campulitropous, mostly pendulous (funiculus free or sometimes adnate 

 to the septum), attached in a single row to each side of the placentae : 

 albumen none. Embryo with the cotyledons variously folded on the 

 radicle (very rarely straight !). — Herbaceous, or rarely somewhat 

 shrubby plants, with a watery, more or less acrid or pungent, juice. 

 Leaves alternate, often divided, exstipulate. Flowers in terminal ra- 

 cemes or corymbs : pedicels mostly ebracteate. 



1. SiUquoscE. 

 Tribe I. ARABIDEiE. DC. 



Silique dehiscent, usually elongated ; valves somewhat plane : sep. 

 turn linear. Cotyledons plane, accumbent (o=), parallel with the sep- 

 tum (i.e. with their edges directed to the placentae). 



1. CHEIRANTHUS. R. Br. in hort. Kew. (ed. 2.) 4. p. 118 ; DC.sysi. 



2. p. 178. 



Silique terete or compressed. Stigma 2-lobed or capitate. Inner sepals 

 saccate at the base. Seeds in a single series, ovate, compressed. 



1. C. capitatus (Dougl.) : somewhat rough ; leaves linear-lanceolate, en- 

 tire or more or less toothed, much attenuate at the base, and, Avith the stem, 

 strigosely pubescent ; hairs closely appressed and 2-parted ; flowers yellow 

 (rather large), densely corymbed; siliques 3 times the length of pedicels. — 

 Hook.Jl. Bor.-Am. l.p. 38. C. asper, Cham. ^ Schecht. in LvincBa, 1. p. 

 14. (excl. syn.) 



California, Chamisso ; Oregon, Douglas. — (T) Stem a foot or more high, 

 acutely angled. Pedicels 5-6 lines long. SiHque 15 lines long and a hne in 

 width : valves marked with a prominent nerve. Stigma capitate, indistinct- 

 ly 2-lobed. Cham., Hook. 



2. C. 7 Pallasii (Pursh) : leaves Hnear-lanceolate, repandly toothed, 

 nearly glabrous ; stem simple, terete, erect; flowers purple. DC. prodr. 1. 

 p. 136; Pursh, fi. 2. p. 436; Hook.Jl. Bor.-Am. 1. p. 38. 



North West Coast. July. Pursh (ex herb. Lamb.) — (2) Stem covered 

 with a closely appressed 2-parted pubescence, 7-9 inches high. Leaves 

 minutely pubescent. Raceme oblong. Pedicels filiform. Silique some- 

 what terete. Stigma minute, subcapitate. DC. — Perhaps a Hesperis. 



