1546 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM 



20. Viguiera brevifolia Greenm. Proc. Amer. Acad. 39: 103. 1903. 

 Coahuila and Durango; type from Mapimi, Durango. 



Much-branched shrub 1 meter high; stem strigillose; leaf blades 1 to 2.1 cm. 

 long, above greenish or canescent, beneath canescent-strigillose; heads 1.4 cm. 

 wide; achenes sparsely pubescent near apex; pappus squamellae equaling the 

 awns. 



21. Viguiera bicolor Blake, Proc. Amer. Acad. 51: 519. 1916. 



Known only from the type locality, between Rio Grande and Jamaltepec, 

 Hidalgo (?). . " 



Shrub; branches canescent-strigillose; leaf blades 1.2 to 1.8 cm. long, greenish 

 above, canescent-strigillose beneath; heads 1.8 cm. wide; achenes subsericeous; 

 pappus squamellae shorter than the awns. 



22. Viguiera greggii (A. Gray) Blake, Contr. Gray Herb. n. scr. 54: 100. 1918. 

 Gymnolomia greggii A. Gray, Proc. Amer. Acad. 15: 36. 1879. 



Coahuila. 



Much-branched undershrub 30 to 40 cm. high, finely canescent; leaf blades 

 broadly ovate or oval, 7 to 25 mm. long, rounded to obtuse, greenish above, 

 canescent-strigillose beneath; heads 1.8 to 4 cm. wide; achenes glabrous, epap- 

 pose. 



62. ALVORDIA T. S. Brandeg. Proc. Calif. Acad. II. 2: 174. 1889. 



Frutescent; leaves opposite, or alternate above, subentire; heads 1 to 5-flow- 

 ered, radiate or discoid, in small terminal glomerules; involucre compressed, 

 strongly graduate, the phyllaries indurate; rays neutral; achenes thickened; 

 pappus of about 10 to 20 unequal paleaceous awns. 



The following treatment contains all the known species of this genus. 



Phyllaries densely strigillose dorsally; rays 1 or 2 1. A. glomerata. 



Phyllaries ciliolate, essentially glabrous dorsally; rays none. 



Leaves ovate, 1.3 to 3 cm. wide 2. A. fruticosa. 



Leaves narrowly lanceolate, 5 to 10 mm. wide 3. A. angusta. 



1. Alvordia- glomerata T. S. Brandeg. Proc. Calif. Acad. II. 2: 174. 1889. 

 Baja California; type from mesas about Purisima and Comondu. 

 Shrubby, strigillose, about 1.3 meters high; leaf blades ovate or oval, 2 to 5 



cm. long, triplinerved, petiolate; involucre 6 to 8 mm. high; rays 1 or 2; disk 

 flowers 2 or 3. 



2. Alvordia fruticosa T. S. Brandeg. Erythea 7: 5. 1899. 

 Baja California; type from San Jose del Cabo. 



Similar; involucre 5 to 6 mm. high; heads 2 or 3-flowered. 



3. Alvordia angusta Blake, Contr. Graj' Herb. n. ser. 52: 42. 1917. 

 Baja California; type from Todos Santos. 



Similar to A. fruticosa; leaves much narrower; heads 1 or 2-flowered. 



63. HELIANTHUS L. Sp. PI. 904. 1753. 



Herbs or shrubs; leaves opposite or alternate; heads small to large, the rays 

 yellow, the disk yellow, brown, or purple; involucre 2 to several-seriate, the 

 phyllaries usually herbaceous at least at tip; rays neutral; achenes thickened; 

 pappus deciduous, of 2 paleaceous awns and sometimes several intermediate 

 squamellae. 



The English name "sunflower" is applied commonl}' to the herbaceous species 

 of the genus, while the usual Spanish names are "mirasol" and "girasol." 



Leaves alternate, the blades 4.5 cm. long or less 1. H. niveus. 



Leaves opposite, the blades up to 12 cm. long 2. H. siinilis. 



