ROBINSON AND GREENMAN. —GENUS VERBESINA. 539 
$5. Preroruyron, Gray. Heads large or medium-sized, solitary 
or very few (rather numerous in V. ovata), mostly terminal on long 
peduncles. Rays present, yellow. Scales of the involucre narrower, 
oblong (broadly so in V. Lindheimert) to linear. Pappus-awns short 
or obsolete, never longer than the breadth of the achene. Leaves 
opposite (except sometimes the uppermost), oblong and sessile or often 
thombic-ovate upon cuneately winged petioles. — Proc. Am. Acad. xix. 
12, & Syn. Fl. i. pt. 2, 287, in part. Pterophyton, Cass. Bull. Soc. 
Philom. 1818, p. 76, in part.— Herbaceous perennials of the Gulf 
States and Mexico. 
* Peduncles winged to the heads: leaves opposite, rhombic to deltoid. 
/ 10. V. Terraprera, Gray, Proc. Am. Acad. xix. 13 (1883). Acti- 
nomeris tetraptera, DC. Prodr. y. 575 (1836); Hemsl. 1. c. 186 (excl. 
syn. V. scabra). Helianthus tetrapterus, Ort. Dec. vi. 74 (1798). 
Coreopsis alata, Cav. Ic. iii. 80, t. 260 (1794).— Mexico, San Luis 
Potosi, Parry & Palmer, no. 4734, Schaffner, no. 257; State of 
Mexico, Bourgeau, no. 604, Pringle, no. 8151; Oaxaca, Conzatti & 
Gonzdlez, nos. 399, 399%, Coulter, no. 370. 
* * Main axis broadly winged up into a compound 12-20-headed corymb: leaves 
alternate, oblong. 
11. V. prerocauta [Moc. & Sess.], DC. Prodr. v. 616 (1836) ; 
A. DC. Calques des Dess. t. 597. V. ovata, Gray, 1. c. (1883). V. 
tetraptera, Klatt, Leopoldina, xx. 94, not Gray. Coreopsis ovata, 
Cav. lc. 41, t. 280 (1794). Actinomeris ovata, Nutt. Gen. ii. 181 
(1818); Hemsl. 1. c. 185. —§. Mexico, Real del Moute, Coulter, no. 
363, Lhrenberg, no. 351; Mt. Orizaba, Seaton, no. 340. 
* * * Peduncles long and wingless: heads solitary or few: stem winged below 
(except in V. Schaffneri, var. exalata). 
+ Leaves oblong, green on both sides, sessile, 
++ Rays yellow: Mexican. » 
12. V. Rosei. Erect herbaceous perennial, 3 to 6 dm. high, bright 
green and appearing glabrous, but under a lens strigillose: stems (nar- 
towly or broadly winged up to the highest pair of leaves) 1 or more from 
& small lignescent stock with tough fibrous roots: leaves (3 to 4 pairs) 
°pposite, oblong to oblong-lanceolate, acute or obtuse, serrulate, 5 to 9 cm. 
long, 1.5 to 2.5 em. broad: peduncles 1 to 2, slender, 1-3-headed ; bracts 
linear ; pedicels long and slender ; heads medium-sized 1 to 1.2 cm. broad 
€xclusive of the rays; involucral scales 1-2-seriate, herbaceous, linear- 
