1162 CAKDUACEAE 



base, pubescent all over : achenes 4 mm. long : pappus-scales longer than the breadth of 

 the achene. 



In dry soil, Virginia to Kentucky, south to Florida and Louisiana. 



3. STOKESIA L'Her. 



Perennial caulescent herbs, with woolly foliage. Leaves alternate : blades spinulose- 

 ciliate near the base, the upper clasping. Heads showy, mainly blue, many-flowered. 

 Involucres depressed : bracts various, the outer foliaceous, spreading, the inner with ap- 

 pressed bases and spinulose-ciliate foliaceous tips. Keceptacle flat, naked. Corollas various, 

 the central ones nearly regular, the outer ones successively more palmately ligulate, the 

 marginal ones with 5-cleft ligules each surpassing the tube in length. Anthers sagittate, 

 not caudate. Stigmas subulate, hirsute. Achenes 3-4-angled, slightly constricted at the 

 ends. Pappus of 4-5 white caducous scales. 



1. Stokesia lafevis (Hill) Greene. Stems 2-5 dm. tall, usually branched, densely 

 woolly above. Leaves glabrous or nearly so ; blades linear-elliptic, oblong-lanceolate or 

 oblong-ovate, 3-20 cm. long, the lower ones narrowed into petioles, the upper sessile, 

 spinulose-ciliate near the base : heads often subtended by leaf-like bracts which pass into 

 the involucre : bracts of the involucre 1-2 cm. long, with conspicuously spinulose margins : 

 corollas bright purplish blue, the marginal ones radiant, 2-3 cm. long, the segments linear- 

 lanceolate. [S. cyanea L'Her.] 



In moist soil, South Carolina to Louisiana. Spring and summer. 



4. HARTWRIGHTIA A. Gray. 



Perennial caulescent herbs, with glabrous foliage. Leaves alternate, mostly on the 

 lower part of the stem : blades entire. Heads few-flowered, stalked. Involucres and flow- 

 ers of each head punctate with resinous glands : bracts in two series, narrow. Receptacle 

 naked. Corollas with a dilated limb, 5-lobed. Anthers appendaged. Achenes 5-angled. 

 Pappus wanting. 



1. Hartwrightia Floridana A. Gray. Stems 4-10 dm. tall, corymbosely branched 

 above. Leaves 1-3 dm. long ; blades obtuse, inconspicuously nerved, the lower oblong, 

 narrowed into margined petioles, the upper linear, much smaller and rather remote : heads 

 peduncled : bracts of the involucres linear, obtuse : corollas white : achenes 4-5.5 mm. long. 



In swamps, peninsular Florida. 



5. SCLEROLEPIS Cass. 



Perennial partly aquatic herbs, with decumbent creeping stems. Leaves whorled : 

 blades narrow, entire. Heads discoid, solitary or rarely 2-4 together. Involucres hemi- 

 spheric or broadly campanulate : bracts usually in 2 series. Eeceptacle conic, naked. 

 Corollas regular : tube shorter than the limb ; lobes 5. Anther-sacs with obtuse bases. 

 Stigmas long, obtuse. Achenes 5-angled, the faces without ribs. Pappus of 5 broad obtuse 

 or truncate nerveless scales. 



1. Sclerolepis uniflora (Walt. ) B.S.P. Glabrous or nearly so. Stems decumbent, 

 2-7 dm. long, usually simple : leaves 4-6 in each whorl ; blades linear or narrowly linear- 

 lanceolate to almost filiform, 1-2.5 cm. long, acute, 1-nerved : peduncles solitary, 2-10 cm. 

 long : heads 6-15 mm. broad : bracts of the involucre linear to linear-lanceolate, 2-2.5 mm. 

 long, acute, erose-serrulate : corollas rose-purple : achenes 1.5 mm. long, enlarged upward. 



In pine-land pools and streams, New Jersey to Florida. Spring and summer. 



6. TRICHOCORONIS A. Gray. 



Annual or perennial, swamp-inhabiting or aquatic herbs, with viscid-pubescent foliage. 

 Leaves alternate or opposite, on the lower part of the stem : blades toothed, partly clasping. 

 Heads discoid, relatively small. Involucres many-flowered, broad or flattish at maturity : 

 bracts nearly equal. Receptacle convex, naked. Corollas regular, pink or rose-purple : 

 tube abruptly dilated into the wide throat : lobes 5. Anther-sacs obtuse at the base. 

 Stigmas relatively long, not enlarged upward. Achenes 5-angled, the faces ribbed. 

 Pappus a crown of many minute bristles. 



1. Trichocoronis Wrightii A. Gray. Stem usually branched at the base, the 

 branches spreading, 1-3 dm. long, finely viscid-pubescent : leaf -blades oblong to oblong- 



