FLOWERING PLANTS AND FERNS OF ARIZONA 953 



61. VIGUIERA 77 



Herbs or shrubs; leaves opposite (at least below), linear to ovate, 

 usually toothed; heads medium-sized, radiate, yellow; rays neutral; 

 achenes laterally compressed, thickened; pappus of 2 awns and 

 several short squamellae, or sometimes none. 



Key to the species 



1. Pappus persistent, of 2 awns and several intermediate squamellae; achenes 

 pubescent; leaves ovate, rarely lanceolate (2). 

 2. Plant shrubby; leaves mostly opposite, deltoid-ovate, 1.5 to 3.5 cm. long, 

 tuberculate-hispidulous; involucre 5 to 9 mm. high__ 1. V. deltoidea. 

 2. Plants strictly herbaceous (3). 



3. Leaves usually thin, on slender petioles, these rarely less and usually much 

 more than 10 mm. long; disk of the heads 7 to 10 mm. high; phyllaries 

 with ovate or oblong-ovate, indurate and ribbed base, and a rather 

 abrupt, linear or sometimes spatulate, herbaceous tip. 



2. V. DENTATA. 



3. Leaves usually firm, very short-petioled (petioles 1 to 8 mm. long) ; disk 

 of the heads 11 to 15 mm. high; phyllaries linear-lanceolate to oblong- 

 lanceolate, acuminate, subherbaceous throughout or indurate below. 



3. V. CORDIFOLIA. 



1. Pappus wanting; achenes glabrous; leaves linear to lanceolate or oval (4). 

 4. Plants perennial (5). 



5. Leaves lance-ovate to linear-lanceolate, 2 to 30 mm. wide. 



4. V. MULTIFLORA. 



5. Leaves oval to elliptic-oblong, 2.4 to 5 cm. long, 14 to 23 mm. wide. 



5. V. OVALIS. 

 4. Plants annual (6). 



6. Phyllaries merely hispid-ciliate, or sometimes also sparsely hispid on the 



back 6. V. ciliata. 



6. Phyllaries densely and more or less canescently strigose or strigillose on 

 "the back (7). 

 7. Leaves lanceolate to linear-lanceolate, 4 to 14 mm. wide; heads rela- 

 tively large, the disk 6 to 14 mm. thick 7. V. longifolia. 



7. Leaves linear or linear-lanceolate, 1.5 to 3 mm. wide; heads relatively 

 small, the disk 6 to 8 mm. thick 8. V. annua. 



1. Viguiera deltoidea A. Gray, Amer. Acad. Arts and Sci. Proc. 



5: 161. 1861. 



The species is represented in Arizona by var. parishii (Greene) 

 Vasey and Rose (V. parishii Greene). Southern Yavapai County 

 to Pima and Yuma Counties, up to 3,500 feet, dry mesas and rocky 

 slopes, January to October. Southern Nevada to southern Arizona, 

 southern California, and northwestern Mexico. 



A small much-branched shrub, of limited value as browse. 



2. Viguiera dentata (Cav.) Spreng., Syst, Veg. 3: 615. 1826. 



Helianthus dentatus Cav., Icon. PL 3: 10. 1795. 

 Viguiera brevipes DC, Prodr. 5: 579. 1836. 

 Viguiera dentata var. brevipes Blake, Gray Herbarium Contrib. 

 54: 83. 1918. 



Cochise, Santa Cruz, and Pima Counties, 3,500 to 5,500 feet> 

 dry slopes and canyons, fields and ditch banks, occasionally in woods, 

 June to October. Western Texas to Arizona and Mexico. 



The var. lancijolia Blake, differing in its narrowly lanceolate leaves 

 less than 2 cm. wide (in the typical form ovate, up to 8 cm. wide), 

 occurs in the Santa Rita and Baboquivari Mountains (Pima County), 

 also in Sonora. 



" Reference: Blake, S. F. a revision of the genus viguiera. Gray Herbarium Contrib. 54: 1-205. 



J918. 



