Part 1, 1914J CARDUACEAE : HELENIEAE 19 



23. Perityle gracilis (M. E. Jones) Rydberg. 



Laphamia gracilis M. E. Jones, Proc. Calif. Acad. II. 5: 703. 1895. 



A suffruticose perennial; stems decumbent or pendent from overhanging rocks, 2-3 dm. 

 long, grayish-puberulent; leaves alternate; petioles 1-2 cm. long; blades 1.5-3 cm. long, broadly 

 ovate in outline, pedately dissected, with the divisions again cleft into oblong or oblanceolate 

 mostly obtuse lobes, puberulent and impressed-punctate; peduncles 3-5 cm. long; involucre 

 turbinate, about 5 mm. high and 8 mm. broad; bracts puberulent, oblanceolate, short-acu- 

 minate; ray-flowers 10-12; ligules light-yellow, oblong, 7-8 mm. long, rather deeply 3-toothed; 

 disk-corollas 2.5 mm. long, the tube about equaling the throat; achenes linear-oblong, 2 mm. 

 long, sparingly ciliate on the slightly callous margin; pappus of a crown of short squamellae 

 and 2 scabrous awns about as long as the achenes. 



Type locality: Below Nagle's Ranch, Buckskin Mountains, Arizona. 

 Distribution: Arizona. 



24. Perityle coronopifolia A. Gray, PI. Wright. 2: 82. 1853. 



Laphamia coronopifolia Hemsl. Biol. Centr. Am. Bot. 2: 210. 1881. 

 ? Laphamia scopulorutn M. E. Jones, Contr. W. Bot. 12: 48. 1908. 



A low suffruticose perennial; gtems branched from the woody base, 1-2 dm. high, slender, 



canescent-puberulent ; leaves small, the lower opposite, the upper alternate, short-petioled, 



blades ovate in outline, 3-7-divided, with linear-oblanceolate often again lobed divisions, 



puberulent and impressed-punctate; peduncles 1-2 cm. long; involucre turbinate, about 5 mm. 



high and 6 mm. broad; bracts oblanceolate, acuminate, puberulent; ray-flowers about 12; 



ligules white, oblong, 5-6 mm. long, 3-toothed; disk-corollas about 2 mm. long, the cylindro- 



campanulate throat about equaling the tube; style-appendages subulate; achenes broadly 



oblong, glabrous on the faces, hispid-ciliate on the slightly callous margins; pappus of a crown 



of numerous lanceolate squamellae and two awns shorter than the achenes. 



Type locality: Copper Mines [Santa Rita del Cobre], New Mexico. 

 Distribution: New Mexico, Arizona, Chihuahua, and Sonora. 



13. MONOTHRIX Torr. in Stansb. Expl. Utah 389. 1852. 



Low scabrous-puberulent corymbosely branched under shrubs. Leaves alternate, short- 

 petioled, usually small and thick, scabrous-puberulent and somewhat punctate; blades mostly 

 ovate in outline. Heads radiate or discoid, at the ends of the leafy branches. Involucre 

 hemispheric; bracts in two subequal series, thick, boat-shaped, double-ribbed, partly enclosing 

 the marginal achenes, rather broad. Receptacle nearly flat, strongly alveolate, naked. Ray- 

 flowers, if present, pistillate and fertile. Disk-flowers numerous; tube of the corolla slender, 

 glandular, slightly shorter than the narrowly funnelform throat. Achenes flat, not ciliate on 

 the margins. Pappus of 1 barbellate awn or wholly wanting. 



Type species, Monothrix Stanshuryana Torr. 



Leaves small and thick; blades 1 cm. long or less; corollas yellow. 



Heads radiate; pappus -awn present. 1. M. Stanshurii. 



Heads discoid. 



Pappus-awn wanting; plant tall, sparingly leafy. 



Involucre 6 mm. high and 5-7 mm. broad. 2. M. megacephala. 



Involucre 3 mm. high and 4—5 mm. broad. 3. M. intricate. 



Pappus usually of a single awn; plant low and very leafy. 



I/Caves spatulate or oblanceolate, entire or nearly so. 4. M. Toumeyi. 



Leaves broadly ovate to rhombic, at least most of them toothed or 

 lobed. 

 Leaves mostly broadly ovate, sinuately toothed. 5. M. congesta. 



Leaves rhombic, 3-lobed above the middle. 6. M. fasligiata. 



Leaves larger and thin; blades 1-1.5 cm. long; corollas cream -colored ; pappus- 

 awn present. 7. AI. Palmeri. 



1. Monothrix Stansburii (A. Gray) Rydberg. 



Laphamia Stansburii A. Gray, PI. Wright. 1: 101. 1852. 

 Monothrix Stanshuryana Torr. in Stansb. Expl. Utah 390. 1852. 



A somewhat fruticulose perennial with a thick woody caudex; stems about 2 dm. high, 

 branched, scabrous-puberulent; leaves mostly alternate; petioles about 0.5 cm. long; blades 



