20 CRUCIFF.R^. 



or with superimposed cells ; style short or 0, st igma simple or 2-lobed, 

 lobes opposite the placentas ; ovules usually many, 2-seriate on 2 parietal 

 placentas, rarely solitary and erect, amphitropous or campylotropous, 

 raphe ventral, micropyle superior. Fruit usually a long or short 2-cdlcd 

 and 2-valved capsule (pod) valves deciduous, leaving the seeds on the 

 persistent placentas (replum), rarely indehiscent, or transversely jointed 

 with 1 -seeded joints. Seeds small, albumen ; cotyledons large, plano- 

 convex or longitudinally folded, foliaceous in germination, radicle turned 

 up on the back of one cotyledon (incumbent) or facing their edges (accum- 

 benf). DISTRIB. All temp, regions, but chiefly of the Old World ; genera 172 ; 

 species 1,200. AFFINITIES. Between Fumariacece and Capparidece. PRO- 

 PERTIES. All parts are nitrogenous and contain sulphur, are pungent, 

 stimulant, and anti-scorbutic, often acrid. Seeds oily. Testa of cress 

 and others mucilaginous when moistened, owing to the swelling and 

 bursting of superficial cells. 



A. Pod elongate (much longer than broad}, dehiscing througJiout its length, 

 flat or turgid, not compressed at right angles to the septum. (Pod sometimes 

 short in Nasturtium, its tip sometimes indehixcent in Brassica. See Draba 

 in B.) 



TRIBE I. ARABIDE7E. Seeds 1-seriate (rarely 2-seriate in Arabis and 

 Nasturtium), cotyledons accumbent. (Flowers white, yellow or lilac.) 



* Stigmas erect or decurrent on the style 1. Matthiola. 



** Stigma, small, simple terminal 



Lateral sepals saccate. Hairs forked 1*. CJieiranthu*. 



Pod terete, valves turgid. Seeds minute, 2-seriate 2. Nasturtium. 



Pod4-angled. Seeds oblong 3. Barbarea. 



Pod flat, valves not elastic 1-nerved 4. Arabis 



Pod flat, valves elastic. Funicle filiform 5. Cardamine. 



Pod flat, valves elastic. Funicle dilated 6. Dentaria. 



TRIBE II. SISYM BRIE-ffi. Seeds usually 1-seriate, cotyledons incumbent, 

 straight, plano-convex. (Flowers white, yellow or lilac.) 



Glabrous or hairs spreading, stigma obtuse 7. Sisymhrium. 



Hairs appressed 2-3-furcate, stigma obtuse 8. Erysimum. 



Hairs spreading, stigmas decurrent on the style 8*. Hespei-is. 



TRIBE III. BRAS SICEJE. Seeds 1-2-seriate, cotyledons incumbent, longi- 

 tudinally folded or very concave. (Flowers yellow.) 



Pod terete or angled. Seeds 1-seriate 9. Brassica. 



Pod compressed. Seeds 2-seriate, compressed 10. Diplotaxis. 



B. Pod short (not or not much longer tlutn broad), dehiscing through its 



whole length, broad, flat or turgid, not compressed at rigid angles to Uif, 

 septum. (Flowers white or yellow.) (Pod sometimes long in Draba ; see 

 Nasturtium in A.) 

 TRIBE IV. ALYSSI NE-flE. Seeds 2-seriate, cotyledons accumbent. 



Petals entire. Pod oblong, flat, many-seeded..'. 11. Draba. 



Petals 2-cleft. Pod oblong, flat or turgid 12. Erophila. 



Petals entire. Pod circular, few-seeded 1 2*. A lyssum. 



Petals entire. Pod inflated, many-seeded 13. Cochlearia. 



TRIBE V. CAMELI NE./E. Seeds 2-seriate, cotyledons incumbent. 



Tall herb, canline leaves sessile auricled 13*. Camelina. 



Small scapigerous water-herb. Leaves subulate 14. Subularia. 



