CRUCIFERAE. 179 



in. long, its valves a1 maturity separating from the placental ribs hut all joined 

 al tip into the stylo (or sometimes splitting up the style to the stigma) ; seeds 

 crest less. 



Eigh dry ridges of the inner Coast Kanges, but not common: Lake Co.; 

 Vaea Mts. ; Mt. Diablo; and southward to San Diego. Also Sierra Nevada 

 (Gwin Mine, Amador Co., Jepson.) Sometimes called "Golden Ear-drops." 



2. D. formosa DC. Bleeding Heart. Acaulescent; rootstock fleshy and 

 spreading; leaves on very long petioles, biternately compound, the divisions 

 incisely cleft or pinnatifid; scapes slightly exceeding the leaves, 2 ft. high, 

 naked, terminated by a cluster of short racemes with subulate bracts; corolla 

 rose-purple (rarely white), ovate-cordate; petals all united to above the middle, 

 the larger with short spreading tips; stigma with a double pair of lobes; seeds 

 crested. 



Shady woods : Oakland Hills ; Marin Co. and northward ; also in the 

 Sierra Nevada. Apr. -June. Sometimes one free filament in each set of 

 the stamens. 



D. uxiflora Kell. Steer's Head. Diminutive alpine herb 1 to 3 in. high 

 with ternately lobed leaves and 1 to 2-flowered scapes from a fascicle of 

 tubers; outer petals very narrow, recurving. — Mt. Lyell, Mt. Dana (W. L. J.) 

 and far northward. 



CRUCIFERAE. Mustard Family. 



Herbs with alternate leaves, no stipules and the flowers in terminal bractless 

 racemes (or in Tropidocarpum with a leafy raceme). Sepals and petals 

 each 4, regular and distinct. Petals rarely none, commonly with claws, the 

 blades spreading in the form of a cross. Stamens 6, commonly tetradynamous 

 (4 long and 2 short), sometimes subequal, sometimes 4 or 2. Ovary superior, 

 2-celled by a thin partition stretched between the placentae; style 1, stigma 

 2-lobed or 1. Fruit a 2-celled capsule, the 2 valves separating from below 

 upwards, leaving behind the placentae and partition, or often 1 -celled and in- 

 dehiscent, or breaking up transversely into 1-seeded joints. Capsule long 

 and narrow (a silique) or short and roundish (a silicle), commonly termed 

 a "pod" and either terete, 4-sided, compressed (flattened parallel to the 

 partition) or obcompressed (flattened contrary to the partition). Seeds in 

 each cell attached alternately to either placenta and occupying the center 

 of the cell (in 1 row) or disposed in 2 rows (the seeds from either placenta 

 not overlapping each other). Embryo always curved, the caulicle folded upon 

 tlif back of one of the cotyledons (incumbent) or along the edge of the 

 cotyledons (accumbent). Herbage always with the characteristic mustard- 

 like or pungent juice. Streptanthus glandulosus has a somewhat irregular 

 flower. 



A. Pod completely dehiscent by two valves. 

 1. Pod a silique, 3 to several times longer than broad. 

 Seeds in 1 row in each cell (except Sisymbrium canescens and Arabis glabra); silique 

 linear or narrowly linear. 

 Racemes leafless. 



Filaments with one or two pairs connate (except 1 or 2 species); silique compressed; 

 sepals colored, commonly purple; petals purple, varying to whitish, the limb 



narrow, commonly undulate-crisped 2. Streptanthus. 



Filaments all distinct. 



Siliijue terete, pointed with a long conical beak prolonged much beyond the valves; 



flowers large, yellow 5. BRASSICA. 



Silique terete, 4-sided or compressed, tipped with a short style or pointless. 



