1162 CAEDUACEAE 



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 foliaceouh^, spreading, the inner with ap- 

 pressed bases and spinulose-ciliate foliaceous tips. Receptacle 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 la^vis (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.l 



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 Floridkna 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. Receptacle 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- 



