192 CARDUACEAE. 



3. B. glomerulifiora Pers. Plants 8-30 dm. tall, barely re-inou>: leaf-blades 

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

 involucres 5-6 mm. long; inner bracts oblong-spat ulate. Hammocks. (Ber.) 



4. B. angustifolia Michx. 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-FLKABANE. 



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

 lucre narrowly linear. 1. P.fwti.hi. 

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



less petloled : inner bracts of the Involucre lanceolntf 



Involucre 4-5 mm. high ; Inner bracts abruptly acuminate. 2. P. ptirpurascrni. 

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



1. P. foetida (L.) B.8.P. Plants 3-10 dm. tall: leaf-blades oblong to ovate- 

 oblong, 3-8 cm. long: inner bracts of the involu. -re- 4 " nun. long: staminate 

 corollas 3.54 mm. long. Everglades and hammocks. F. K. (Bah., Cuba.) 



2. P. purpurascens (8w.) 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 hamnm 



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. PTEBOCAULON Ell. Tomentose or woolly stout herbs. Leaves 

 alternate: blades entire or shallowly toothc.l. lUvurrcnt. Heads borne in con- 

 tiguous or separated glomerate cymes. Involucres rather narrow, densely 

 flowered: bracts unequal, the inner slightly narrower than the outer. l'i>til 

 late flowers marginal: corollas filiform. Perfect flowers central: corollas --. ith 

 a funnelform throat and a long tube; lol>es linear or lanceolate. A 

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



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



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



staminate corollas linear. Pinelands.F. K. HI.M K HOOT. 



20. 8ACH8IA Oriseb. Inconspicuously pubescent, slender herbs. Leaves 

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

 Involucres campanulate: bracts very unequal, 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. 8. bahamensia Urban. Plants 1-6 dm. tall: blades of the basal leaves firm, 

 spatulate. 3-7 rm. long, those of the stem-leaves much -.mailer: involucres 

 peduncled; bracts various, the outer membranous the inner chaffy. .', rt mm. 

 long, very narrowly linear: achenes 2.5 mm. long. Pinelands. F. K. (Huh.) 



