210 CRUCIFER^. 



united, but distinct at the very base and slightly free above. (Greek 

 dis, twice, and kentron, a spur, some species 2-spurred.) 



Stems leafy; flowers yellow, petals distinct 1 D, chrysantha. 



Acaulesceht; scape naked; flowers rose-purple, petals united . 2. D. formosa. 



1. D. chrysantha H. & A. Glaucous plants with stiif coarse 

 leafy stems 2 to 3 ft. high; leaves bipinnate, J to 1 ft. long or more, 

 the divisions cleft into narrow lobes; flowers yellow, in a large 

 racemose panicle; corolla linear-oblong, only slightly cordate, ^ in. 

 long; petals distinct; capsule f to 1 in. long; style slender, persistent, 

 at dehiscence of the capsule splitting up to the stigma; seeds orestless. 



High dry ridges of the inner Coast Ranges, but not common: Lake 

 Co.; Vaca Mountains; Mt. Diablo; Crystal Springs, San Mateo Co., 

 Vasey, 187-5; and southward. Sometimes called "Golden Bar- 

 drops." 



2. D. formosa DC. Bleeding Hbakt. Acaulescent; root- 

 stock fleshy and spreading; leaves on very long petioles, biternately 

 compound, the divisions incisely cleft or pinnatifld; scapes slightly 

 exceeding the leaves, 2 ft. high, naked, terminated by a cluster of 

 short racemes with subulate bracts; corolla rose-purple, 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: Moraga Caiion near Oakland, C'hriK. Palache- com- 

 mon in Marin Co. and nortliward; also in the Sierras. Apr.-June. 



38. CRUCIFER/E. 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. Fruit a capsule the 2 valves sepa- 

 rating from below upwards, leaving behind the placentse and parti- 

 tion, or sometimes indehiscent, 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 obcom- 

 pressed (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 the 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. 



