1162 CARDUACEAE 
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 foliaceoustips. 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 laévis (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 D’ 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 Ploridana 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 Et 
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-purp in 
tube abruptly dilated into the wide throat: lobes 5. Anther-sacs obtuse at the i 
Stigmas relatively long, not enlarged upward. Achenes 5-angled, the faces d 
Pappus a crown of many minute bristles. 
1. Trichocoronis Wrightii A. Gray. Stem usually branched at the ber een 
branches spreading, 1-3 dm. long, finely viscid-pubescent : leaf-blades oblong to o g 
