46 Contributions from the Gray Herbarium 
a. Leaves canescent or whitened heat b. 
d, c. 
e. ne hispid-pilose-c se-ciliate; pappus present... .11. MG Cao ox 
hyllaries apt d oon : pappus n WG ae its ss V. ensifolia. 
apex 
d. _Phyllaries strongly ciliat 
Achene more or less a icoiuk pappus present. 
8. V. buddleiaeformis. 
e. Achene glabrous; pappus none .............-. 9. V. Hemsleyana. 
a. Leaves green or paler but not canescent beneath, g 
g. Heads hag large (disk 15-25 mm. high, 174 35 mm. 
t 
h. heaven pubescent beneath on all the veins, even the 
est, and usually also between them.......... 6. V. excelsa. 
h. Leaves pubescent beneath chiefly on the veces nerves 
Oe PO ac eS os 7. V. pachycephala. 
q. —— eae (disk 7-15 mm. high, 9-19 mm. 
€: Laven ov 
J Teeolone dceriate, 15-20 mm. high ........... 3. V. urticiformis. 
res Involucre 5-seriate, 9-14 mm. high .............. 5. V. Schultziz. 
Leaves a or oblon “lanceolate to oval, k. 
é. Leaves strigillose beneat 
Rvllacies obscurely iciilose and ciliolate...1. V. get a 
l._ Phyllaries conspicuously strigillose — ciliate V. flava 
vi neath, m 
. Heads a 3 11; outer phyllaries strongly ciliate, 
otherwi not HO Se saree y pubescent; 
leaven 8-13. 5 Pe ee a i er, 10. V. hypochlora. 
m. Heads 1-4; outer let rye ase oe pu- 
bese nt} leaves 3-7.3 ¢ 
n. Involucre 9-12 mm. aie Ae een ee Pea eee rs V. flava. 
nm. Involucre 15-20 mm. high ............... ee & pane eect 
1, V. latibracteata (Hemsl.), comb. nov. Branching herb, in 
habit like Sclerocarpus Schiedeanus; stem slender, purplish, striate, 
very sparsely strigose or practically glabrous. Leaves remote, 
ier (only the upper seen), lanceolate, attenuate, at base 
uminate into the margined petiole, obscurely appressed-serrulate, 
ne. dull green both sides, above lepidote-tuberculate- 
strigillose, beneath sparsely strigillose chiefly along veins and 
gland-dotted, 6-7.5 (—‘ 13”) em. long, 1-2.5 em. wide; petioles 
margined, 1-2 em. long. Heads loosely panicled, on subglabrous 
strongly striate pedicels 1 dm. long or less; disk in fruit convex, 
7-8 mm. high, 12-13 mm. wide. Involucre about 4-seriate, 8 mm. 
