1542 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM 



Pappus present; achene pubescent. 



Leaf blades ovate or triangular-ovate, acute or sometimes obtuse. 



20. V. brevifolia. 

 Leaf blades rotund or roundish-ovate, obtuse to rounded or retuse. 



21. V. bicolor. 

 Leaves larger, usually not canescent, or if small, then heads 2 to 4. 

 Leaves laciniate or deeply jagged-serrate. 



Plant resinous; stem pubescent throughout 10. V. laciniata. 



Plant not resinous; stem glabrous below 11. V. subincisa. 



Leaves entire or merely serrate. 



Plant densely panno.se-tomentose 15. V. lanata. 



Plant not pannose-tomentose. 



Leaf blades narrowly oblong to broadly linear, denselj^ canescent- 



hispidulous beneath 1. V. angustif olia. 



Leaves ovate or lance-ovate, usually not canescent-hispidulous beneath. 



Leaf blades 8 to 12 mm. long 14. V. microphylla. 



Leaf blades larger. 



Leaves densely silky or pilose-tomentose beneath. 



Pappus none; achenes glabrous 7. V. borabycina. 



Pappus present; achenes pubescent. 



Leaves densely silky-canescent beneath. 



6. V. grammatoglossa. 

 Leaves densely pilose-tomentose beneath. 



12. V. tomentosa. 

 Leaves not densely silky or pilose-tomentose beneath. 

 Pales tipped with stiff abrupt spreading mucros. 



2. V. sphaerocephala. 

 Pales without stiff spreading mucros. 



Heads at first subcylindric, very numerous; involucre 2-seriate, 



5 to 6 mm. high 5. V. quinqueradiata. 



Heads not subcylindric, usually few. 



Livolucre 4 to 5-seriate, of linear-lanceolate to lanceolate 

 phyllaries with thickened midrib. 



Leaves ovate to oval 8. V. pringlei. 



Leaves lanceolate to ovate-oblong 9. V. seemannii. 



Involucre 2 to 4-seriate, of oblong or lance-ovate phyllaries 

 without strongly thickened midrib. 

 Phyllaries with ovate indurate base and lance-oblong 

 herbaceous apex, canescently strigillose and often 



strigose or hispid 13. V. deltoidea. 



Phyllaries oblong, with conspicuous pale margins, on 

 back glabrous, pilosulous, or pilose. 

 Phyllaries and petioles sparsely ciliate. 



3. V. maculata. 

 Phyllaries and petioles strongly ciliate. 



4. V. eriophora. 



1. Viguiera angustifolia (Hook. & Arn.) Blake, Proc. Amer. Acad. 51: 518. 

 1916. 



Tithonia angustifolia Hook. & Arn. Bot. Beechej^ Voy. 435. 1841. 



Viguiera blepharolepis A. Gray, Proc. Amer. Acad. 19: 5. 1883. 



Sinaloa, Tepic, and Jalisco; type from Tepic. 



Suffrutescent (?); stem slender, densely strigose or strigillose, subglabrate; 

 leaves opposite, short-petioled, the blades 3 to 9.5 cm. long, 4 to 13 mm. wide; 

 heads solitary, 3 to 5 cm. wide; involucre 11 to 19 mm. high, 4 to 5-seriate, the 

 phyllaries oval to oblong, canescently strigillose and ciliate. 



