CARDUACEAE. 187 



1. M. batatifolia DC. Plants glabrous: leaf -blades deltoid to hastate-ovate, 

 1-3 cm. long, entire or repand: heads in small irregular clusters: bracts of the 

 involucre 3-4 mm. long: corollas about 3 mm. long. [Willugbaeya hetero- 

 phylla Small.] Everglades. F. K. (Bah., Cuba, Ant.) 



2. M. cordifolia (L.) Willd. Plants densely pubescent: leaf -blades ovate to 

 hastate, 6-15 cm. long, coarsely toothed or lobed: bracts of the involucre 7-8 

 mm. long: corollas about 6 mm. long. Hammocks. F. K. (Cuba, Ant.) 



6. LACINIAEIA Hill. Typically simple-stemmed herbs with thick root- 

 stocks. Leaves alternate, often numerous: blades narrow, entire. Heads borne 

 in spikes, racemes, panicles, or rarely in cymes. Involucre ovoid to cylindric or 

 turbinate. Corolla-throat narrow-funnelform, much longer than the slightly 

 narrower tube : lobes lanceolate. Anther-appendages entire or notched. Achene 

 short, ribbed. Pappus of many barbelate or plumose bristles. BUTTOX- 



SXAKEROOT. BLAZIXG-STAR. 



Bracts of the involucre obtuse : heads peduncled. 



Involucres narrowed at the base, turbinate. 1. L. gracilis. 



Involucres rounded at the base, campanulate. 2. L. laxa. 



Bracts of the Involucre acute or acuminate : heads sessile. 



Bracts of the involucre abruptly pointed : corollas less than 



1 cm. long : anthers reaching the corolla-lobes. 3. L. laevigata. 



Bracts of the involucre acuminate : corollas over 1 cm. long : 



anthers far down in the tube. 4. L. Chapmunii. 



1. L. gracilis (Pursh) Kuntze. Stems 2-10 dm. tall, cinerous-pubescent : 

 blades of the lower leaves linear: inner bracts of the involucre linear, 5-6 mm. 

 long, obtuse. Pinelands. 



2. L. laxa Small. Stems 4-6 dm. tall, thinly tomentulose: blades of the lower 

 leaves linear : inner bracts of the involucre narrowed at the tip, 4-5 mm. long : 

 achenes mostly over 3 mm. long. Coastal sand-dunes. 



3. L. laevigata (Xutt.) Small. Sterns 6-14 dm. tall, glabrous or nearly so: 

 blades of the lower leaves narrowly linear: inner bracts of the involucre 8-9 

 mm. long: corollas 8-9 mm. long: filaments pubescent, fully as long as the 

 anthers. Pinelands. F. K. 



4. L. Chapmanii (T. & G.) Kuntze. Stems 2-6 dm. tall, tomentose: blades of 

 the lower leaves narrowly linear, mostly less than 10 cm. long: inner bracts of 

 the involucre 11-13 mm. long, acuminate: achenes 5.5-6 mm. long. Pinelands. 



7. CARPHEPHORUS Cass. Simple-stemmed herbs. Leaves alternate: 

 blades narrow, flat, or acerose, entire. Heads in a terminal corymbose cyme. 

 Involucre hemispheric to campanulate. Corolla-throat narrowly funnelform, 

 longer than the slightly narrower tube: lobes lanceolate. Androecium included: 

 anther-appendages mostly notched. Stigmas filiform. Achene ribbed. Pappus 

 of many capillary bristles. 



1. C. corymbosus (Xutt.) T. & G. Stems 3-9 dm. tall, pubescent: leaf-blades 

 spatulate or oblong-spatulate below to cuneate, oblong, or ovate above: inner 

 bracts of the involucre 5-7 mm. long, erose: corollas about 8 mm. long. 

 Pinelands. 



8. KUHNIA L. Perennial herbs. Leaves alternate: blades narrow, 

 resinous-dotted. Heads borne in open or compact clusters. Involucre narrow- 

 cylindric. Corollas narrowly funnelform, the tube and throat scarcely dis- 

 tinguishable: lobes triangular to lanceolate. Anther-appendages ovate, obtuse. 

 Achenes columnar, striate. Pappus of many capillary bristles. 



