450 CARDUACEAE. 



the chaff enveloping the flowers. Corollas regular, the limb 5-lobed. Anthers 

 truncate, entire. Achenes glabrous, truncate, angled; pappus none. [Greek, 

 equal chaff.] About 5 species, of tropical America, the following typical. 



1. Isocarpha oppositifolia (L.) R. Br. ; DC. Prodr. 5: 107. 1836. 



Calea oppositifolia L. Sp. PL ed. 2, 1179. 1763. 

 Isocarpha angustaia Griseb. Fl. Br. W. I. 376. 1861. 



Perennial, usually pubescent, stem rather stiff, divaricately branched, 3-6 

 dm. high. Leaves opposite, sessile or nearly so, linear to lanceolate, 3-nerved, 

 entire, acutish or obtuse at the apex, narrowed at the base ; heads solitary or 

 few together at the ends of slender naked peduncle-like branches; involucre 

 45 mm. high, its bracts oblong, strongly striate, acute and mucronate. 



White-lands and rocky places, Andres, Great Guana Cay, Great Exuma, Long 

 Island, Great Ragged Island and Atwood Cay: Cuba; Jamaica; Tobago: Trinidad; 

 Curasao; Margarita; Texas through Mexico to Venezuela. BOSTON CATNEP. 



21. BORRIOHIA Adans. Fam. PI. 2: 130. 1763. 



Fleshy, more or less canescent, branching shrubs of the seacoast, with 

 opposite, entire or denticulate, cuneate oblong spatulate or obovate, 1-3-nerved 

 leaves, and terminal large long-peduncled heads of both tubular and radiate 

 yellow flowers. Involucre hemispheric, its bracts slightly unequal, imbricated 

 in 2 or 3 series, the inner ones coriaceous. Receptacle convex, chaffy, the chaff 

 rigid, concave, subtending or enwrapping the disk-flowers. Ray-flowers pistil- 

 late, fertile. Disk-flowers perfect, the corolla tubular, 5-toothed, the style- 

 branches elongated, hispid. Achenes of the ray-flowers 3-sided, those of the disk- 

 flowers 4-sided. Pappus a short dentate crown. [Named for Olaf Borrick, a 

 Danish botanist.] About 5 species, natives of America. Type species: Buph- 

 thalmum frutescens L. 



1. Borrichia arborescens (L.) DC. Prodr. 5: 489. 1836. 



BvphtJialmum arborescens L. Syst. ed. 10, 1227. 1759. 



Borrichia argentea DC. Prodr. 5: 489. 1836. 



Borrichia glabrata Small, Fl. SE. U. S. 1263, 1340. 1903. 



A branching shrub, 1.3 m. high or less, densely white silky-canescent, or 

 green and glabrous. Leaves fleshy, oblanceolate to spatulate, entire, 6 cm. 

 long or less, 6-15 mm. wide, acute or obtuse and cuspidate at the apex, nar- 

 rowed to the base, sessile, obscurely veined ; heads mostly solitary, rarely 2 

 together; peduncle 2-5 cm. long; involucre 1-1.5 cm. high, its bracts obtuse, 

 or acute, appressed; rays few, 6-9 mm. long. 



Coastal rocks and sands and margins of brackish ponds throughout the archi- 

 pelago : Florida; Bermuda; Jamaica; Cuba to Anegada and Guadeloupe; Yucatan. 

 Foliage either white-canescent or green and glabrous, sometimes on the same plant. 

 BAT MARIGOLD. SEA OX-EYE. SEA-BUSH. Catesby, 1 : pi. 93. 



22. WEDELIA Jacq. Enum. 8, 28. 1760. 



Herbs or shrubs, with opposite, toothed or entire leaves, and peduncled 

 heads of both radiate and discoid yellow flowers. Involucre ovoid to hemi- 

 spheric, its bracts in about 2 series, the outer somewhat foliaceous. Receptacle 

 flat or convex, its scales enveloping the disk-flowers. Ray-flowers pistillate. 

 Disk-flowers perfect, their corollas tubular with a cylindric to campanulate 

 limb. Achenes oblong to obovate, smooth, pilose or tubercled, truncate or conic 



