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Compositaceae 381 
CC. Plant somewhat hairy. 
E. Leaves herbaceous; involucre-bracts linear. E. (Pyrrocoma hirta; Hoore- 
bekia hirta; Pyrrocoma howellii.) 
A. hirtus Gray 
EE. Leaves coriaceous or rather rigid; involucre-bracts lanceolate or oblong. 
F. Stems not markedly slender; involucre-bracts lanceolate. 
G. Radical and lower stem-leaves lanceolate. E. (Pyrrocoma lanceolata.) 
A. lanceolatus T. & G. 
GG. _ Radical and lower stem-leaves oblanceolate. E. 
A. insecticruris Hend. 
FF. Stems markedly slender; involucre-bracts broadly-oblong. E. (Purro- 
coma tenuicaulis.) A. tenuicaulis Eat. 
Subgenus MACRONEMAE—Puberulent to tomentose, much branched. Leaves 
entire, sessile. Heads radiate or rayless, many-flowered; involucre-bracts I-veined, outer 
with foliaceous and spreading tips. Ray-flowers 0—9 (ours). | Akenes pubescent 
(ours). Pappus tawny or brown or reddish. 
A. Rays none; flowers about 25; plant white-tomentose; leaves obtuse. EF. (Ma- 
cronema discoideum.) A. discoideus (Nutt.) 
AA. Rays 2—9; disk-flowers 10—16. 
B. Leaves obtuse or mucronate; heads 10—14 mm. high; disk-flowers 10—16; 
plant puberulent to white-tomentose. E. (Macronema greenei; Hookebekia 
greenei mollis; macronema mollis.) 
A, greenei Gray 
BB. Leaves acute; heads 16—20 mm. high; disk-flowers 20—30; plant puberu- 
lent. E. (Macronema suffruticosa.) 
A. suffruticosus Gray 
Subgenus STENOTAE—Tomentose to nearly glabrous; stems simple, 0.2—-3 dm. 
high (ours). Leaves entire, 1—3-veined. Heads radiate, many-flowered, not in 
corymbs; involucre-bracts |-veined, papery at least at margin and tip; tips closely ap- 
pressed. Ray-flowers 8—12. Akenes densely silky-villous. Pappus white or darker; 
bristles scabrous. 
A. Herbaceous; involucre woolly. E. (Stenotus lanuginosus; Hoorebekia lanuginosa.) 
A. lanuginosus Gray 
AA. _ Shrubby at least at base; involucre pubescent to glabrous. 
B. Leaves 1|-venied, linear-spatulate to filiform. E. (Stenotus stenophyllus; Hoore- 
bekia stenophylla.) A. stenophyllus Gray 
BB. Most of the leaves 3-veined below, lower leaves spatulate or wider. 
C. Plant scabrous-pubescent. FE. (Stenotus acaulis.) 
A. acaulis Gray 
CC. Plant glabrous. E. (Stenotus caespitosus.) 
A. caespitosus (Nutt.) 
Subgenus TONESTAE—Puberulent; stems simple, I—3 dm. high , (ours). 
Leaves entire, petioled. Heads radiate, many-flowered; involucre-bracts |-veined, the 
outermost somewhat foliaceous and spreading at tip. Ray-flowers 15—-20. Akenes 
glabrous or slightly pubescent (ours). Pappus white; bristles scabrous. W.C. (Sten- 
-_otus lvallii; Hoorebekia lyallii; Tonestus lyallii; A. laceratus.) 
A. lyallii Gray 
