346 
CARDUACEAE. 
2. Tonestus pygmaeus (T. & G.) A. Nels. (Aplopappus pygmaeus A. 
Gray; Macronema pygmaeum Greene) On mountains of Wyo. and Colo.— 
Alt. 10,000-13,000 ft.—Clear Creek; Gray’s Peak; Little Kate Mine, La Plata 
Mountains; Mt. Princeton; Cameron Pass, Larimer Co.; Pike’s Peak; Bald 
Mountain; Silver Plume; Mt. Garfield; near Pagosa Peak; Beaver Creek; 
Raton Range; Middle Park. 
19. SOLID AGO L. Golden Rod. 
Leaves glabrous or slightly pubescent along the veins and on the margins. 
Leaves not triple-veined; branches of the inflorescence not recurved-spread- 
ing; heads not secund. 
Bracts of the inflorescence lanceolate or linear-lanceolate, acute or acuminate. 
Leaves ciliate at the base. I. Virgaureae. 
Leaves not ciliate at the base. IV. Glaberrimae. 
Bracts of the inflorescence oblong or linear-oblong, obtuse. 
Leaves, at least the basal ones, toothed; stem-leaves few ; plants 1-4 dm. 
high. II. Humiles. 
Leaves all entire; stem very leafy, 4-8 dm. high. III. Speciosae. 
Leaves triple-veined ; heads more or less secund on recurved-spreading branches. 
Plants slender, not very leafy, 2-4 dm. high; stem-leaves narrowly oblan- 
ceolate or linear. 
Plant tall, leafy, 4-10 dm. high; stem-leaves lanceolate. 
Leaves densely canescent. 
Leaves lanceolate; bracts narrowly linear-lanceolate. 
Leaves, at least the lower ones, oblanceolate or obovate. 
IV. Glaberrimae. 
V. Serotinae. 
VI. Serotinae. 
VII. Incanae. 
I. Virgaureae. 
Plant low and slender, 1-3 dm. high ; inflorescence corymbiform ; branches with 
a single or a few corymbose heads. 
Heads 7-9 mm. high ; inner bracts linear-lanceolate, of about the same length 
as the flowers and pappus; plant 2-3 dm. high. 1. S. scopulorum. 
Heads 5-7 mm. high ; bracts lanceolate ; the inner shorter than the flowers and 
the pappus; plant usually less than 2 dm. high. 2. S. ciliosa. 
Plants stout, 3-4 dm. high ; inflorescence paniculate ; branches racemiform; heads 
7-9 mm. high. 
Basal leaves broadly oblanceolate, acute; stem pubescent. 
3. S. rubra. 
Basal leaves narrowly oblanceolate, obtuse ; stem glabrous up to the inflorescence. 
4. S. laevicaulis. 
II. Humiles. 
Plant low, 1-1.5 dm. high; inflorescence with few heads, short, congested. 
5. S. decumbens. 
Plant taller, 2-4 dm. high; inflorescence with many heads, elongated. 
Leaves not ciliate; bracts oblong; inflorescence usually narrow. 
6 . S. oreopliila. 
Leaves ciliate at the base; bracts linear; inflorescence open. 
7. 6*. dilatata. 
III. Speciosae. 
One species. 8. S. pallida. 
IV. Glaberrimae. 
Heads less than 5 mm. high; stem slender. 
Inflorescence decidedly viscid; leaves indistinctly triple-veined. 
9. V. viscidula. 
Inflorescence not viscid; leaves distinctly triple-veined. 
