1170 CARDUACEAE 
gested cymes: leaf-blades ovate to oblong-ovate, 3-6 cm. long, obtuse, manifestly crenate, 
cordate or subcordate at the base, short-petioled: involucres 3 mm. high: bracts linear- 
subulate, rather acuminate, finely pubescent : receptacle low-conic : corollas purplish blue : 
achenes 1.5 mm. long. 
In low grounds, southern Texas and adjacent Mexico. 
5. Conoclinum integrifólium (A. Gray) Small. Similar to C. betonicum in habit, but 
usually more slender, and much less and more finely pubescent: leaf-blades ovate or rhom- 
bic-ovate, 2-4 cm. long, rounded at the apex, entire or essentially so, cuneately narrowed 
with slender petioles: involucres about 4 mm. high: bracts linear-subulate, acuminate : 
corollas purplish blue. [Eupatorium betonicum var. integrifolium A. Gray.] 
In low grounds, southern Texas and adjacent Mexico. 
12. WILLUGBAEYA Neck. 
Perennial herbaceous twining vines, with branching stems. Leaves opposite: blades 
usually of a hastate or deltoid type, slender-petioled. Heads discoid, in corymbose-cymose 
clusters. Involucres 4-flowered : bracts 4, or rarely 8, nearly equal. Receptacle small, 
naked. Corollas white or pink, regular. Anthers obtuse and entire at the base. Stigmas 
elongated, acutish. Achenes 5-angled, truncate. Pappus of one series of many scabrous 
hair-like bristles. [Mikania Willd.] The plants flower mainly in summer and fall. 
Involucres less than 4 mm. high. 1. W. heterophylla. 
Involucres over 4 mm. high. ; 
Tip of the leaf-blade acute: involucres about 5 mm. high, 2. W. scandens. 
Tip of the leaf-blade obtuse: involucres about 6 mm. high. 8. W. Halei. 
1. Willugbaeya heterophylla Small. Glabrous. Stems several m. long: leaves 
various, often clustered on short branchlets ; blades deltoid to hastate-ovate, 1-3 em. long, 
or sometimes smaller, acute or acuminate, entire or repand, cordate; petioles sometimes 
longer than the blades: corymbs 1-3 em. broad: heads rather few: involucres narrow, 
about 3 mm. high; bracts linear, obtuse, ribbed : achenes stout, 1-1.5 mm. long, glabrous 
or nearly so, the faces slightly concave: pappus-bristles 2.5 mm. long. 
In sandy fields, No Name Key, Florida. 
2. Willugbaeya scándens (L.) Kuntze. Finely pubescent or nearly glabrous. 
Stems sometimes densely matted : leaf-blades deltoid-ovate or hastate, acuminate, undulate 
or angulately lobed, cordate ; petioles often nearly as long as the blades: heads numerous: 
involucres narrow, about 5 mm. high; bracts linear, acuminate or apiculate: achenes 
Ended 2 mm. long, glabrous or nearly so, the faces nearly flat : pappus-bristles 2.5 mm. 
ong. 
In moist thickets and swamps, Massachusetts to Ontario. Indiana, Florida and Texas. _ 
3. Willugbaeya Hàlei Small. Puberulent or glabrate in age. Stems somewhat 
angled : leaf-blades triangular-hastate, 5-12 cm. long, often acuminate, but blunt, repand- 
dentate, cordate: corymbs rounded : heads in numerous globular clusters : involucres nar- 
row, fully 6 mm. Euh bracts linear, acuminate, chaffy: achenes 4-5 mm. long, sharply 
angled, the faces concave : pappus-bristles 5 mm. long. 
In low grounds, Louisiana. 
13. TRÍLISA Cass. : 
Perennial caulescent herbs, with fibrous roots. Leaves alternate: blades various, 
those of the basal leaves with broad petioles, those of the stem-leaves sessile or clasping. 
Heads discoid, in thyrsoid or corymbose panicles, 5-10-flowered. Involucres campanulate, 
peduncled: bracts slightly imbricated, nearly equal in length. Receptacle flat, naked. 
Corollas purplish or white, regular. Anthers obtuse at the base. Stigmas slender, ob- 
tuse. Achenes 10-ribbed, but nearly terete. Pappus of 1-2 series of barbellate hair-like 
bristles. 
"EE : i f : n 1. T. paniculata. 
Stems viscid-pubescent : heads in thyrsoid panicles : achenes pubescent. X mp rer atissima. 
Stems glabrous: heads in corymbose panicles: achenes glandular. 
1. Trilisa paniculata (Walt.) Cass. Stems viscid-pubescent, 3-9 dm. tall. ee 
leaves 6-30 cm. long; blades elliptic to almost linear, acute or slightly acuminate: 
stem-leaves with elliptic or linear-lanceolate, sessile or somewhat clasping blades: invoiu 
cres 4-4.5 mm. high ; bracts oblong to linear, or commonly slightly broadened upward, 
obtuse : achenes 2 mm. long, pubescent. 
In damp pine lands, Virginia to Florida. Summer and fall. 
