192 CAEDUACEAE. 



3. B. glomeruliflora Pers. Plants 8-30 dm. tall, barely resinous: leaf -blades 

 spatulate to cuneate-obovate, 2-5 cm. long, often sharply toothed: pistillate 

 involucres 5-6 mm. long; inner bracts oblong-spatulate. — Hammocks. — (Ber.) 



4. B. angustifolla Miehx. Plants 5-25 dm. tall, resinous: leaf-blades nar- 

 rowly linear, 1-8 cm. long, entire or nearly so : pistillate involucres 4-5 mm. 

 long; inner bracts oblong. — Hammocks and sand-dunes. — F. K. {Bah.) 



18. PLUCHEA Cass. Herbs or shrubs. Leaves alternate: blades usually 

 toothed, often prominently veined. Heads borne in corymb-like or glomerate 

 cymes. Involucres turbinate, campanulate, or hemispheric, rather many- 

 flowered : bracts unequal, the inner much longer and much narrower than the 

 outer. Pistillate flowers marginal: corollas filiform. Perfect flowers central: 

 corollas with a funnelform or campanulate throat: lobes triangular to lanceo- 

 late. Pappus a single series of capillary bristles. — Marsh-fleabaxe. 



Plants perennial : leaf-blades sessile and partly clasping : inner bracts of the invo- 

 lucre narrowly linear. 1- f- foetiilti. 

 Plants annual : leaf-blades narrowed at the base and more or 

 less petloled : inner bracts of the involucre lanceolate. 

 Involucre 4-5 mm. high ; inner bracts abruptly acuminate. 2. P. purpurascens. 

 Involucres 6-8 mm. high ; inner bracts long-acuminate. 3. P. camphorata. 



1. P. foetida (L.) B.S.P. Plants 3-10 dm. tall: leaf -blades oblong to ovate- 

 oblong, 3-8 cm. long: inner bracts of the involucres 4-5 mm. long: staminate 

 corollas 3. .5-4 mm. long. — Everglades and hammocks. F. K. {Bah., Cuba.) 



2. P. purpurascens (Sw.) DC. Plants 3-14 dm. tall: leaf -blades ovate-lanceo- 

 late to elliptic or oblong, 4-10 cm. long: outer bracts of the involucre ovate, 

 acute; intermediate bracts abruptly pointed. — Everglades and hammocks. — 

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



3. P. camphorata (L.) DC. Plants 3-15 dm. tall: leaf -blades elliptic, lanceo- 

 late, or oblong, 3-15 cm. long: outer bracts of the involucre oblong, acute: 

 intermediate bracts acuminate. — Coastal sand-dunes. 



19. PTEROCAULON Ell. Tomentose or woolly stout herbs. Leaves 

 alternate: Vjlades entire or shallowly toothed, decurrent. Heads borne in con- 

 tiguous or separated glomerate cymes. Involucres rather narrow, densely 

 flowered: bracts unequal, the inner slightly narrower than the outer. Pistil- 

 late flowers marginal : corollas filiform. Perfect flowers central : corollas with . 

 a funnelform throat and a long tube; lobes linear or lanceolate. Anthers 

 shorter than the filaments. Pappus a single series of capillary bristles. 



1. P. undulatum (Walt.) Ell. Plants 2-7 dm. tall: leaf-blades oblong to lance- 

 olate, 4-12 cm. long, undulate: involucres 3.5-4 mm. high; lobes of the 

 staminate corollas linear. — Pinelands. — F. K. — Black-root. 



20. SACHSIA Griseb. Inconspicuously pubescent, slender herbs. Leaves 

 alternate, mostly basal: blades toothed. Heads scattered in open corymbs. 

 Involucres campanulate: bracts very unecjual, the inner much longer and some- 

 what narrower than the outer. Pistillate flowers marginal: corollas filiform. 

 Perfect flowers central: corollas narrowly tubular-funnelform; lobes ovate. 

 Pappus a single series of very slender bristles. 



1. S, bahamensis Urban. Plants 1-6 dm. tall: blades of the basal leaves firm, 

 spatulate. 3-7 cm. long, those of the stem-leaves much smaller: involucres 

 peduncled; bracts various, the outer membranous, the inner chaffy. 5-6 mm. 

 long, very narrowly linear: achcnes 2.5 mm. long. — Pinelands. — F. K. {Bah.) 



