322 FLORA OF TEXAS. 



Suborder I. Tubuliflorse. 



Tribe I. Vernoniaceae. Heads discoid ; i\\(^flo2cers 

 all tubular and perfect ; hranclies of the style terete, filiform, 

 liairy all over; the stigmatic lines only on the lower part. 

 —Herbs, with alternate leaves and purple floAvers. Pcctis 

 alone has pistillate rays and yellow flowers. 



VEKNONIA, Schreb. Irox-weed. 



Heads many-flowered, the flowers all equal and tubular; 

 involucre shorter than the flowers, the scales closely imbri- 

 cated in several rows; recejytacle naked; achenia cylindri- 

 cal, ribbed; j^^jjpus double, the exterior consisting of very 

 short scale-like bristles, the interior of copious capillary 

 bristles. — Perennial herbs, ^ith. alternate leaves, and corym- 

 bose purple flowers. 



V. Noveboracexsis, Willd. Stem more or less pubes- 

 cent, branched above; leaves lanceolate, serrate, mostly 

 rough ish above, smooth or pubescent beneath ; corymbs 

 spreading, involucre hemispherical, the scales fringed, ovate, 

 ending in a long filiform point, or simply acute. (V. to- 

 mentosa. Ell. ; V. praealta, Willd.) River-banks and low 

 ground. Stem 3°-6° high ; scales of the involucre purple, 

 and usually covered with web-like hairs. 



V. fasciculata, Michx., var. altissima, Torr. and Gray. 

 Stem tall, and, like the lanceolate serrate leaves, sraoothish ; 

 i;zr6>/?^crc small, hemispherical; the scales ovate, acute or 

 mucronate, fringed, appressed. (V. altissima, Nutt.) Low 

 ground. Stem 6°-10° high; leaves 6-12' long. 



V. AXGUSTIFOLIA, Miclix. Stem slender, smooth or 

 hairy, very leafy ; leaves linear or linear lanceolate, smooth- 

 ish, or pubescent and roughish, the lowest ones sparingly 

 denticulate, the upper entire, wdth the margins revolute; 

 corymbs mostly unbel-like ; involucre bell-shaped; the 

 scales lanceolate, fringed, acute or conspicuously mucronate. 

 (V. scaberrima, Nutt.) Dry pine-barrens. Stem 2°-3° 

 high. _ 



