194 CARDUACEAE. 



depressed: bracts often broad, in 2 or 3 series. Throat of the corolla much 

 longer than the tube. Filaments generally as long as the black-tipped anthers 

 or nearly so. Stigmas stout or flattened. 



Leaf-bl.ndes linear, oblanceolate, or spatulate. 1. J/, lanccolata. 



Leaf-blades of an ovate or hastate type. 



Plants with tall erect stems : leaf-blades manifestly petioled. 

 Bractlets of the receptacle long-acuminate, like the bracts 



of the involucre, coarsely pubescent. 2. M. pariifolia, 



Bractlets of the receptacle acute or short-acuminate, like 



the bracts of the involucre, finely puberulent. 3. M. brevifolia. 



Plants with many short prostrate or decumbent stems radi- 

 ating from a woody root : leaf-blades sessile or nearly so. 4. M. radiata. 



1. M, lauceolata Benth. Stems 2-8 dm. tall, strigillose: leaf -blades linear to 

 linear-oblanceolate, 4—8 cm. long: larger bracts of the involucre rhombic-ovate, 

 acute: corollas about 4 mm. long. — Everglades and low- pinelands. 



2. M. parvifolla Small. Stems 3-8 dm. tall, very rough-hispidulous, slender, 

 sparingly branched: leaf -blades prominently hastate, 2-5 cm. long, or longer, 

 the lateral lobes prominent, coarsely toothed or entire, the middle lobe elongate, 

 contracted between the lateral lobes and the dilated apex, usually coarsely 

 toothed above, the petioles rather short: heads few, usually very loug-peduucled: 

 larger bracts of the involucre 5-7 mm. long. — Pinelands and coastal sand- 

 dunes. — F. K. 



3. M. brevifolia O. E. Schulz. Stems 8-24 dm. tall, somewhat rough-pubes- 

 cent, often stout, considerably branched: leaf -blades ovate to deltoid or ovate- 

 hastate or deltoid-hastate, 8-15 cm. long, obtuse or acute; usually crenate, the 

 petioles rather long: heads several or numerous, mostly rather short-peduncled: 

 larger bracts of the involucre 3.5-5 cm. long. — Hammocks and coastal sand- 

 dunes,— F. K. (Bah., Cuba.) 



4. M. radiata Small. Stems radially spreading from a woody root, 1-4 dm. 

 long: leaf-blades ovate, 1-4 cm. long, hastately lobed and irregularly toothed: 

 larger bracts of the involucre ovate, 5.5-6.5 mm. long, obtuse: corollas mostly 

 about 6 mm. long. — Pinelands. 



26. WEDELIA Jacq. Erect, diffuse, or creeping herbs, or partially 

 woody plants. Leaves opposite: blades entire or toothed or somewhat lobed. 

 Heads erect, solitary or clustered, radiate. Involucre broadly campanulate: 

 bracts in 2 or 3 unequal series. Eay-flowers few: corollas with a long tube, 

 and mainly yellow ligule. Disk-corollas with a cylindric-campanulate throat 

 longer than the tube : lobes ciliate. Free portions of the filaments about as 

 long as the corolla-tube. Pappus crown-like. [Stemmodontia Cass.] 



1. W. trilobata (L.) A. Hitchc. Stem and branches creeping: leaf-blades 

 elliptic to cuncate, fleshy, 3-10 cm. long, coarsely few-toothed or slightly 3-5- 

 lobed: involucres about 1 cm. high: ligules of the ray 8-12 mm. long: disk- 

 corollas 6-7 mm. long. — Shores of Bay Biscayne. — (Bah., Cuba, Ant.) 



27. BORRICHIA Adans. Fleshy maritime herbs or shrubs. Leaves oppo- 

 site: blades thick, entire, or toothed. Heads erect, on stiff peduncles. Invo- 

 lucre hemispheric or flatfish: bracts fleshy or leathery. Ray-flowers few. 

 Disk-corollas with a cylindric-fuunelform throat and a very short tube: lobes 

 eciliate. Free portions of the filaments much longer than the corolla-tube. 

 Pappus crown-like. — Sea ox-eye. 



Outer bracts of the involucre spreading or rcflexed at maturity : liractlets of the 

 receptacle spine-tipped. 1. Ji. frniescma. 



Outer bracts of the involucre appressed at maturity : bractlets 



of the receptacle obtuse or barely mucronate. 2. B. arhorrsccns. 



