CARDUACEAE. 195 



1. B. frutescens (L.) DC. Plants 2-7 dm. tall: leaf-blades linear-spatulate 

 to ohovate, li-C cm. long: outer bracts of the involucre acute, the inner ones 

 subulate-tipped. — Shores of Bay Biseayne and sand-dunes. — F. K. (Ber.) 



2. B. arborescens (L.) DC. Plants 2-12 dm. tall: leaf-blades oblanceolate or 

 spatulate-oblauoeolate, 3-6 cm. long: outer bracts of the involucre acute, the 

 inner ones rounded at the apex. — Shores of Bay Biseayne and sand-dunes. — - 

 F. K. {Ber., Bah., Cuba, Ant.) 



28. HELIANTHUS L. Erect or creeping herbs. Leaves alternate or 

 opposite: blades entire or toothed. Heads solitary or clustered. Involucre 

 campauulate, cylindric, or depressed: bracts various, often narrow, sometimes 

 elongate. Ray-flowers few or many, or rarely wanting. Disk-corollas with a 

 cylindric throat and a very short tube: lobes eciliate. Free portions of the 

 filaments much longer than the corolla-tube. Pappus of 2 awns or scales which 

 are sometimes accompanied by smaller ones. 



1. H. debilis Nutt. Stems 3-9 dm. long, scabrous: leaf-blades deltoid or 

 somewhat hastate to ovate-lanceolate, 4-8 cm. long, repand or shallowly 

 toothed: bracts of the involucre lanceolate or linear-lanceolate, 8-10 mm. long: 

 ligules of the ray 10-15 mm. long: disk 15-20 mm. wide. — Pinelands and sand- 

 dunes. — F. K. — Sunflower. 



29. PHAETHUSA Gaertn. Herbs or shrubby plants. Leaves alternate or 

 opposite: blades entire or toothed, more or less decurrent. Heads solitary or 

 numerous and clustered. Involucre narrow or broad: bracts not slender- 

 tipped. Ray-flowers few, with a very short or obsolete corolla-tube, the ligules 

 white or yellow, or wanting. Disk-corollas with a funnelform throat, con- 

 tracted into a shorter tube : lobes lanceolate to triangular-lanceolate. Fila- 

 ments slightly shorter than the anthers. Pappus of 1-3 awns, or obsolete. 



1. P. laciniata (Poir.) Small. Stems 7-16 dm. tall, tomentulose: leaf -blades 

 ovate to oblong-ovate in outline, 5-22 cm. long, the segments sometimes repand : 

 larger bracts of the involucre about 6 mm. long: disk-corollas about 5 mm. 

 long: achenes obovate, 5-6 mm. long. — Pinelands. — Crownbeard. 



30. COREOPSIS L. Erect or diffuse herbs. Leaves various. Heads con- 

 spicuously radiate. Involucre campanulate to hemispheric: bracts distinct or 

 nearly so, the outer ones narrow. Ray-flowers several: corollas with yellow, 

 particolored, or pink ligules. Disk-corollas with a funnelform throat and a 

 stout tube. Achenes with entire or pinnate wings, or wingless. — Tickseed. 



Achenes with entire scarious wings. 1- C. LeavenioortML 



Achenes with fimijriate or dissected winged margins. 



Lower leaves shorter or a little longer than the stem- 



internodes. -■ ('■ aiiytistifolia. 



Lower leaves much longer than the stem-internodes. 



Blades of the basal leaves linear-oblong to linear. 3. C. longifolia. 



Blades of the basal leaves oblong, elliptic or oblanceolate. 4. C. gladiata. 



1. C. Leavenworthii T. & G. Plants 5-15 cm. tall, glabrous: blades of the 

 lower leaves mostly with 2 or more narrow lobes (or broad in C. Leavenworthii 

 Garberi) , those of the tipper leaves mostly entire and narrow: outer involucral 

 bracts subulate-lanceolate, 1-2 mm. long: achenes roundish oval, 2.5-3 mm. 

 long, the wing as broad as the body. — Everglades and low pinelands. — F. K. 



2. C. angustifolia Ait. Plants 5-7 dm. tall: blades of the lower leaves spatu- 

 late or oblanceolate, entire: outer involucral bracts ovate, 2-3 mm. long: 

 achenes oval, 2.5-3 mm. long. — Everglades. 



