246 
equal involucral bracts in a single series (subtended by a few bractei- 
form leaves), villous receptacle, slender achenes with a tapering or 
beaked summit, and soft pappus. 
1. T. angustifolia DC. Much branched, 3 to 6 dm. high, sericeous-puberulent to 
glabrate, leafy up to the heads: leaves sessile, rather rigid, from broadly to very 
narrowly lanceolate: heads simply fascicled or singly terminating leafy branchlets, 
9 to 12-flowered: involucral bracts gibbous and indurated at base in age: pappus 
barely fulvous.—Hills and cafions of southwestern Texas, west of the Pecos. 
118. APOGON EIl. 
Low glaucescent mostly glabrous annuals branching from the base, 
with lanceolate (or lower oblong) leaves from entire or repand to den- 
tate or the radical lyrate-pinnatifid (uppermost closely sessile, often 
seemingly opposite), rather small scattered heads of yellow flowers on 
slender peduncles, usually 8 oblong-lanceolate herbaceous involucral 
bracts (becoming concave and with tips conniving in fruit), naked re- 
ceptacle, terete obovoid 10-ribbed somewhat scabrous achenes, and 
rarely an obsolete vestige of pappus. 
1. A. humilis Ell. Pedunecles naked, or rarely obscurely hispid under the head: 
head 4 mm. high in fruit: corollas pure yellow, little longer thaninvolucre: achenes 
oblong-obovate.—Open ground, extending from the Gulf States into Texas, 
2. A. gracilis DC. Sometimes slender and strict, not rarely stouter than the pre- 
ceding, often some bristly hairs on stem and lower leaves: peduncles usually glan- 
dular-hispid some way below the head, which is commonly 6 mm. high in fruit: co- 
rollas orange,conspicuously exserted,twice as long as the involucre: achenes thicker 
and obtuser at apex, with sometimes an obscure vestige of pappus.—Rocky prairies 
of Texas. 
3. A. Wrightii Gmy. Resembling slender and narrow-leaved forms of preceding, 
rather diffuse: heads equally small: achenes larger and thicker, little contracted at 
either end, and with comparatively large areola, which is bordered by obscure ves- 
tige of pappus.—Eastern Texas (Wright), Dr. Gray suggests that this may be a 
hybrid between A. gracilis and Krigia occidentalis. 
119. KRIGIA Schreb. (DWARF DANDFELION.) 
Small herbs branching from the base, with chiefly radical lyrate or 
toothed leaves, small heads of yellow flowers terminating the naked 
scapes or branches, thin involucral bracts in about 2 rows, short and 
truncate top-shaped or columnar terete or angled achenes, and double 
pappus (the outer of thin pointless chaffy scales, the inner of delicate 
bristles.) 
1. K. occidentalis Nutt. Annual, commonly somewhat glandular: leaves obovate 
to lanceolate, entire, lyrately lobed or pinnatifid: heads 4 to 6mm. high, with 5 to 
8 oblong-lanceolate involucral bracts (becoming firmer, erect and keeled in fruit, 
with a conspicuous midnerve): achenes turbinate: pappus of 5 conspicuous rounded- 
obovate scales with as many alternating bristles or awns.—Prairies of Texas. 
2. K. Virginica Willd. Annual, often sparsely hispidulous, with stems or scapes 
several and becoming branched and leafy: earlier leaves roundish and entire, the 
others narrower and often pinnatifid: heads 6 to 8 mm. high, with 9 to 18 thin and 
narrow involucral bracts (reflexed after the fall of the achenes): achenes turbinate 
and 5-angled: pappus of 5 to 7 short roundish scales and as many alternating capil- 
lary bristles. —Sandy ground, extending from the Atlantic and Gulf States into 
Texas, at least as far west as Gillespie County (Jermy), 
