398 



CABDUACEAE. 



1. Polymnia Uvedalia L. 



Yellow or Large-flowered Leaf- 

 cup. Bear's-foot. (Fig. 436.) 

 Rough-pubescent, stout, branched, 

 2°-6° high. Leaves broadly ovate 

 or deltoid, 3-nerved, abruptly con- 

 tracted above the base, minutely 

 ciliate, more or less pubescent on 

 both sides, angulate-lobed, the 

 lower often 1° long and broad, 

 petioled, the upper sessile, some- 

 what clasping; heads few l*'-2^' 

 broad; rays 10-15, linear-oblong, 

 bright yellow ; exterior bracts of the 

 cup-like involucre ovate-oblong, ob- 

 tuse, 4"-10" long; achenes laterally 

 compressed, nearly 3" long. 



Rocky and sandy hillsides, espe- 

 cially between Castle Harbor and 

 Harrington Sound ; on Abbots' Cliff, 

 and locally in Paget. Eastern United 

 States. Apparently native, though 

 regarded by Lefroy as naturalized. 

 Flowers from spring to autumn. 



12. PARTHENIUM L. 



Perennial, mostly pubescent or canescent herbs, or shrubs, with alternate 

 leaves, and small corymbose or paniculate heads of both tubular and radiate 

 white or yellow flowers. Involucre broadly campanulate or hemispheric, its 

 bracts imbricated in 2 or 3 series, obtuse, appressed, nearly equal. Receptacle 

 convex or conic, chaffy, the chaff membranous, siirrounding the disk-flowers. 

 Ray-flowers about 5, pistillate, fertile, their ligules short, broad, 2-toothed or 

 obcordate. Disk-flowers perfect, sterile, their corollas 5-toothed, the style 

 undivided. Anthers entire at the base. Achenes compressed, keeled on the 

 inner face, margined, bearing the per- 

 sistent ray on the summit. Pappus of 

 2-3 scales or awns. [Greek, virgin.] 

 About 12 species, natives of America, 

 the following typical. 



1. Parthenium Hysterophorus L. 

 Parthenium. Santa Marl\. (Fig. 

 437.) Annual, strigose or sometimes 

 slightly hirsute. Stems l°-2i° tall, 

 branched; leaves oblong to ovate in out- 

 line, 1-2-pinnately parted, the segments 

 lanceolate to linear, pinnatifid or toothed ; 

 heads numerous; involucre saucer-like, 

 about 2V' broad; bracts concave, the 

 outer rhombic or elliptic-rhombic, the 

 inner broader, cuneate at the base; ray- 

 flowers few; rays whitish, about i" 

 broad; achenes obovate, about *" long. 



Common in waste and cultivated 

 ground. Naturalized. Native of the south- 

 ern United States and tropical America. 

 Flowers from spring to autumn. 



