About 1 5 species bordering oceans and large lakes in temperate North America, 

 Eurasia and Australia. 



1. Upper joint of pod less than 1 cm. long, delicately 4-ridged; pedicels more 



slender than rachis; infructescence not geniculate 



1. C. fusiformis. 



1. Upper joint of the pod over 1 cm. long or more, coarsely 8-ridged; pedicels 



nearly same diameter as rachis; infructescence geniculate 



2. C geniculata. 



1. Cakile fusiformis Greene. Fig. 477. 



Stems erect or spreading, 3-7 dm. long, fleshy; leaves 5-15 cm. long, ovate 

 in outline, laciniate-pinnatifid, obtuse, the segments linear; racemes greatly 

 elongating, reaching 2-4 dm. long, rachis not geniculate; pedicels more slender 

 than rachis, 3-5 mm. long; fruit slender, 15-25 mm. long, the lower joint turbi- 

 nate, nearly terete, usually 1 -seeded, the upper joint subulate or lance-linear 

 (longer than the lower). 



Sandy areas near the ocean, mainland and offshore islands, edge of water and 

 in periodical inundated areas, flowers any month; Fla. to Tex. 



2. Cakile geniculata (Robins.) Millsp. Fig. 477. 



Stout glabrous herbs; stem branching and more or less spreading, 1-4 dm. 

 long; leaves 3-7 cm. long, oblanceolate to linear-oblanceolate, entire or with 

 a few coarse rounded teeth; raceme 1-2 dm. long, strongly geniculate at maturity; 

 pedicels very stout, 3-5 mm. long, spreading or ascending; fruit nearly terete, 

 2-3 cm. long, the lower joint with a prominent border at the summit, the upper 

 joint lanceolate or oblong-lanceolate and usually curved, usually 1 -seeded but 

 occasionally 2-seeded (twice as long as the lower joint). 



Beaches and sandy places near ocean, mainland and offshore islands, edge 

 of water and in periodically inundated areas, flowers any month; n.w. Fla. to Tex. 



11. Selenia Nutt. 



Low glabrous annuals with pinnately dissected leaves, caulescent or acaules- 

 cent; flowers odoriferous, in loose leafy-bracted racemes or on peduncles arising 

 from the axils of a rosette of leaves; sepals spreading or erect, thickened with 

 a low crest to markedly appendaged on exterior surface just below apex; petals 

 obovate to spatulate, yellow; siliques subsessile to stipitate, flattened parallel 

 to septum to inflated, broadly oblong to depressed globose; seeds biseriate in 

 the silique, flattened, strongly margined or winged; cotyledons accumbent. 



Five species, all from southwestern United States and adjacent Mexico. 



1 . Silique valves with vesicles present; siliques sessile; sepals persistent to fruit 

 maturity 1. S. grandis. 



1. Silique valves glabrous; siliques with at least a short stipe; sepals shed shortly 



after anthesis (persisting somewhat in S. dissecta) (2) 



2(1). Siliques margined, tapered above and below, flattened parallel to septum; 

 pedicels over 3 cm. long 2. S. dissecta. 



2. Siliques not margined, rounded above and below, inflated and depressed- 



subglobose; pedicels less than 3 cm. long 3. 5. Jonesii. 



1. Selenia grandis Martin. 



Winter annual, branched near base with the lateral decumbent branches 

 equaling or exceeding the central erect stem; main stem or branches to 6 dm. 

 long; leaves bipinnate, petiolate, glabrous or with vesicular trichomes along 

 midvein or petiolule, to 2 dm. long; inflorescences very leafy with each pedicel 

 subtended by a leaflike bract; sepals with a prominent hornlike appendage, 



983 



