CRUCIFER^E. (MUSTARD FAMILY.) 39 



16. CAPSELLA, Vent. SHEPHERD'S PUBSE. 



Pouch inversely heart-shaped-triangular, flattened contrary to the narrow par- 

 tition ; the valves boat-shaped, wingless. Seeds numerous. Cotyledons incum- 

 bent. Annuals : flowers small, white. (Name a diminutive of capsida, a pod.) 



1. C BURSA-PASTORIS, Mcench. Boot-leaves clustered, pinnatifid or 

 toothed ; stem-leaves arrow-shaped, sessile. Waste places ; the commonest of 

 weeds. April -Sept. (Nat. from Eu.) 



17. SUBULARIA, L. AWLWORT. 



Pouch oval, turgid, somewhat flattened contrary to the broad partition. Seeds 

 several. Cotyledons long and narrow, incumbently folded transversely, i. e. 

 the cleft extending to the radicular side of the curvature. Style none. A 

 dwarf stemless perennial, aquatic ; the tufted leaves awl-shaped (whence the 

 name). Scape naked, few-flowered, l'-3' high. Flowers minute, white. 



1. S. aquatica, L. Margin of lakes in Maine. v June, July. (Eu.) 



18. SE1VEBIERA, DC. WART-CRESS. SWINE-CRESS. 



Pouch flattened contrary to the narrow partition ; the two cells indehiscent, 

 but falling away at maturity from the partition as closed nutlets, strongly wrin 

 kled or tuberculate, 1 -seeded. Cotyledons as in the last, -r- Low and diffuse or 

 prostrate annuals or biennials, with minute whitish flowers. Stamens often only 

 2. (Dedicated to Senebier, a distinguished vegetable physiologist.) 



1. S. didyma, Pers. Leaves 1 - 2-pinnately parted; pods notched at the 

 apex, rough-wrinkled. (S. pinnatifida, DC. Lepidium didymum, L.) Waste 

 places, at ports, &c., Virginia and Carolina : an immigrant from farther South. 



2. S. CoRON6pus, DC. Leaves less divided, with narrower lobes ; pods not 

 notched at the apex, tubercled. Virginia, Pursh. Rhode Island, Robbins. (Adv. 

 from Eu.) 



19. C A KILE, Tourn. SEA-ROCKET. 



Pod short, 2-jointed across, angular, fleshy, the upper joint flattened at the 

 apex, separating at maturity; each indehiscent and 1 -celled, 1 -seeded; the lower 

 sometimes seedless. Seed erect in the upper, suspended in the lower joint. 

 Cotyledons rather obliquely accumbent. Sea-side, branching, fleshy annuals. 

 Flowers purplish. (An old Arabic name.) 



1. C. Americana, Nutt. (AMERICAN SEA-ROCKET.) Leaves obo 

 vate, sinuate and toothed ; lower joint of the fruit obovoid, emarginate ; the 

 upper ovate, flattish at the apex. Coast of the Northern States and of the 

 Great Lakes. July - Sept. Joints nearly even and fleshy when fresh ; the 

 upper one 4-angled and appearing more beaked when dry. 



20. RAPHANUS, L. RADISH. 



Pods linear or obleng, tapering upwards, 2-jointed ; the lower joint often seed 

 less and stalk-like ; the upper necklace-form by constriction between the seeds, 



