L90 CRUCIFEKAK. 



spreading rosette; lower Leaves petioled, j)innatifi<l, rarely entire, the ter- 

 minal lobe largest; apper leaves merely dentate, sessile-;niricul;ite ; petals white, 

 •"•i to 1 ' a lines long; pedicels elongating in fruit, 4 lines long; pods obcordate, 

 - ' ■_- to .'! lines broad, many-seeded, strongly flattened. 



Common in pastures, orchards and by waysides; naturalized from Europe. 

 Variable. 



2. C. procumbens (L.) Fries. Three to fi in. high with ascending 

 branches from the base; leaves oblanceolate or spatulate, or the lower more or 

 Less pinnatifid; flowers minute, % line long or less; sepals ovate-elliptic, thin- 

 margined, about equaled by the white petals; pods elliptic-oblong, entire at the 

 apex, 1 to l 1 /-* lines long; pedicels filiform, in fruit 3 or 4 lines long and divari- 

 cately spreading. — (C. divaricata Walp.) 



Alkaline soil from Vallejo (ace. Bot. Cal.), Alameda and Byron southward 

 to Kern Co. 



15. CAMELINA Crantz. 



Erect annual with sagittate-clasping leaves. Flowers small, yellow, in loose 

 racemes. Pod obovate or pear-shaped, beaked with the slender, persistent 

 style; valves convex with the edges flattened, forming a narrow margin around 

 the pod; partition broad; seeds several in each cell, oblong, marginless; cotyle- 

 dons incumbent. (Greek camai, dwarf, and linom flax.) 



1. C. sativa Crantz. False Flax. Stem simple or branching above, 

 l'_. to 2 ft. high, leafy, nearly glabrous; leaves oblong to lanceolate, entire 

 or dentate; flowers rather small, light yellow; pedicels in fruit ascending; pods 

 3 1 /) or 4 lines long, 2 to 2*4 lines broad. 



Old World weed of grain fields: Siskiyou Co., Butler; Berkeley ace. Greene. 



16. ATHYSANUS Greene. 



Low annual, leafy below, the short stem divided at or near the base into few 

 or many simple elongated filiform branches or racemes which are unilaterally 

 flower-bearing throughout. Flowers minute, promptly reflexed or recurved. 

 Petals linear or none. Stamens 6, nearly or quite equal; filaments slender. 

 Pod small, orbicular, indehiscent, 1-celled, or 2-celled by a thin partition, 

 wingless; cotyledons accumbent. (Greek a-, without, and thusanos, fringe, 

 the fruit wingless, the type species taken out of the genus Thysanocarpus, 

 whose fruit is broadly margined.) 



Pods plane, numerous on the racemes 1. A. pusillus. 



Pods twisted at maturity; racemes lax, the pods often distant 1 in. or more 



2. A. unilateralis, 



1. A. pusillus (Hook.) Greene. Plants 4 to L2 in. high; herbage pubescent 

 with simple or branching hairs; racemes :! to 9 in. long: Leaves broadly oblong 

 with aboul •"- coarse teeth oil each side, 3 to 5 lines long, rarely varying from 

 2 to 9 lines; ovary 1 celled; ovules 2 to 1, only one maturing, that attached at 

 base of the pod; fruiting pedicels recurved, 1 to .*? lines long; pods orbicular, 

 Btrongly flat toned :; , to 1 line long, hispid all o\'er with hooked hairs. — (Thy- 

 sanocarpus pusillus Nook.) 



Common everywhere on low bills and gravelly plains in the Toast Ranges; 

 also occurring in the Sierra Nevada foothills. 



2. A. unilateralis (.1 ») Jepson. Ilal.it of the preceding; racemes lax, 



diffuse, or horizontal and trailing, in age rigid and wiry, (! to 18 in. Long; 

 pods round-oval, 1 to l'_- lines broad, hispidulous, twisted when mature, the 



pedicels thick, recurved, '•_• to 1 line long; seeds <; t<> 10.— (Draba unilateralis 



B8.) 



