( 207 ) 
(iv) Species-group Lindheimerianae 
Leaves narrow, entire or sparingly serrate, tomentose or pubes- 
cent beneath; heads 21-flowered; scales all appressed, but irregu- 
larly imbricated, the exposed portion of the inner ones dispropor- 
tionately longer than that of the middle or outer ones. Species 
all Texan. 
43. VERNONIA LINDHEIMERI A. Gray, Proc. Am. Acad. 1: 46. 
1846 
Type locality: ‘*in rupestribus prope New Braunfels, Texas.” 
Distribution: East-central and southern Texas, from the vicinity 
of Dallas south and southwest to the Gulf of Mexico, and possibly 
extending west to New Mexico. The species prefers dry rocky 
hills and prairies. 
V. Lindheimeri is a well-marked form of but little variability, 
and that mostly in the size of the plant and the number of heads in 
the inflorescence. One sheet, Hayes 339, has leaves white-tomen- 
tose on both sides, but that may be a juvenile condition. 
74. WERNONIA GUADALUPENSIS Heller, Muhlenbergial: 28. rgor. 
Erect, 4-10 dm. high, simple to the inflorescence, the stem faintly 
striate, thinly covered with white pubescence or nearly glabrous; 
leaves numerous, crowded, thin or firm, usually somewhat scythe- 
shape, narrowly linear- igneeolee or linear, 8-15 cm. long, 0.5-1 
cm. wide, entire or sparsely toothed, acute or acuminate, narrowed 
below, glabrous above, thinly pubescent beneath, the midvein 
compact; heads all peduncled or rarely a few sessile, mostly 21- 
flowered, 12 mm. high at maturity; involucre campanulate, 6 mm. 
high; scales all appressed, ey imbricated, the inner much 
exceeding the outer, more or less thinly white-tomentose, ciliate or 
arachnoid, rounded or obtuse to acute or acuminate; achenes promi- 
nently 1 me pubescent; pappus tawny to purple, the outer series 
conspicuo 
Type inca Kerrville, Kerr County, Texas. 
Distribution: central Texas. 
he specimens cited above agree throughout in the one character 
of irregularly imbricated bracts, but otherwise they show a wide 
range of variability. The leaves are sometimes straight (Szan- 
field) and the variation in leaf-pubescence and involucral scales is 
very wide. 
The specific nature of V. guadalupensis is indeed doubtful. 
