CRUCIFEEiS. (mustard FAMILY.) 23 



§ 2. Pod in dehiscent, 1-celled, 

 Pod orbicular, winged with a thin broad margin; flowers minute. ..Thysanocarpus. 9 

 Pod long, pithy; seeds large; flowers large, veiny - . . Raphanus. 10 



1. CARD AMINE, L. 



Pod linear, with somewhat thickened margins, merely pointed or beaked above; valves 

 flat, nerveless. Seeds in one row somewhat flattened, wingless; cotyledons flat, accum- 

 bent. Sepals equal. Petals white or pinkish. 



1. C. paucisecta, Benth. Stems from small deep-seated tubers, erect, 8 to IS inches 

 high; leaves various; the upper deeply lobed or parted, the lower often simple; petals 

 6 to 9 lines long; pods 1 to l^- inches long. 



2. ARABIS. L. 



Pod linear; valves 1 -nerved, not strongly. Seeds in 1 or 2 rows, flattened; cotyledons 

 accumbent. Sepals short or narrow, rarely colored. Petals with a narrow claw, white, 

 rose-colored, or purple. 



1. A. blepharophylla, Hook. & Am. Stems often tufted 4 to 12 inches high; 

 leaves strongly ciliate, sometimes sparingly sinuate-toothed, the lower obovate or broadly 

 Bpatulate, the cauline oblong, sessile; petals bright purple, 6 to 9 lines long. 



2. A. Bre-weri, Wat. Cespitose, canescent, with dense stellate pubescence; stems 2 to 

 10 inches high; petals 1 to 4 lines long, deep rose-color; sepals purplish; pods spreading 

 or recurved. 



3. CHEIRANTHUS, L. 



Pod elongated, compressed; valves 1 -nerved or carinate. Seeds in one row, flattened, 

 not winged; cotyledons accumbent, or rarely oblique. Calyx not colored, the outer sepals 

 strongly gibbous. Stigma with two spreading lobes. 



1. C. asper, Cham. & Sch. Eather sparingly pubescent with appressed 2-parted 

 hairs; stem simple erect, leafy, 1 to 3 ft. high; leaves spatulate or oblanceolate, the lower 

 long petioled, entire or sinuate-toothed; sepals broad 4 to 6 lines long, half the length 

 of the bright yellow or orange petals; pods 1^ to 2 inches long. 



4. ERYSIMUM, L. 



Pod 4-angled by the prominent mid-nerve of the valves, not stipitate; cotyledons 

 incumbent or oblique. Sepals, petals and stigma like the last. 



1. E. asperum, DC. Similar to the last; sepals narrower; petals itsually creamy 

 white to yellow. 



5. BRASSICA, L. Mustard. 



Pod nearly terete or somewhat 4-sided, pointed with a long conical beak. Seeds in 



