Part 1, 1914] CARDUACEAE : HELENIEAE 21 



6. Monothrix fastigiata (Brand.) Rydberg. 



Laphamia fastigiata Brand. Bot. Gaz. 15; 451. 1899. 



A suffruticose perennial with cespitose woody caudex; stems several, about 1 dm. high, 



scabrous-puberulent ; lower leaves opposite, spatulate, petioled; stem-leaves rhombic- 



spatulate, 1-2 cm. long, trifid, or the upper smaller and entire; heads solitary at the ends 



of the stems, short-peduncled, discoid; involucre campanulate, 3-4 mm. high and nearly as 



broad; bracts about 15, linear, acute, hispidulous-puberulent; disk-flowers 30-40; corollas 



light-yellow, the tube puberulent; achenes 2 mm. long, slightly ciliate on the margins; awn 



solitary or sometimes wanting. 



Type locality: Sheep Mountain, Nevada. 

 Distribution: Kjiown only from the type locality. 



7. Monothrix Palmeri (A. Gray) Rydberg. 



Laphamia Palmeri A. Gray, Proc. Am. Acad. 13: 372. 1878. 



Laphamia Palmeri lenella M. E. Jones, Proc. Calif.-Acad. II. 5: 703. 1895. 



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



A suffruticose perennial; stem, about 2 dm. high, scabrous-puberulent; leaves short- 

 petioled; blades submembranaceous, deltoid or subcordate, 1-1.5 cm. long, sinuate-dentate, 

 3-ribbed, hispidulous; heads in leafy corymbs; peduncles 1-2 cm. long; involucre turbinate, 

 4-5 mm. high, 6-7 mm. broad; bracts oblanceolate, amte, boat-shaped at the base, puberulent; 

 rays wanting; disk-flowers about 30 or more; corollas cream-colored, 3 mm. long; tube shorter 

 than the cylindro-campanulate throat; achenes oblong, puberulent, 2.5 mm. long; pappus of 

 a single scabrous awn, about as long as the achene. 



Type locality: Beaverdam, northwest Arizona. 

 Distribution: Arizona. 



.14. LEPTOPHARYNX Rydberg, gen. nov. 



Low glandular or cinereous perennials with short woody caudex. Leaves alternate, or 

 opposite, or both, petioled; blades mostly cordate or reniform in outline, from toothed to deeply 

 dissected. Heads radiate or discoid, sohtary, peduncled at the ends of the branches. In- 

 volucre hemispheric, of bracts in a single or two equal series; bracts narrow, with a double 

 rib, more or less boat-shaped at least below. Receptacle flat or nearly so. Ray-flowers, if 

 present, pistillate, fertile; ligules white or yellow. Disk-corollas yellow, numerous; tube short 

 and slender, glandular-puberulent, much shorter than the cylindric throat; limb 4-toothed. 

 Style-branches with long, subulate or filiform appendages. Achenes flattened, with more or 

 less callous and ciliate margins. Pappus normally of a minute crown of squamellae and 1 or 2 

 awns, but either or both in a few species wanting. 



Type species, Perityle Parryi A. Gray. 



Heads radiate. 



Leaves not deeply divided. 



Plant puberulent, not at all glandular. 1. L. leptoglossa. 



Plant decidedly glandular. 

 Leaves not acutely lobed. 



Plant finely glandular-puberulent; leaves mostly obtuse. 2. L. Parryi. 



Plant more or less viscid-arachnoid-hairy. 



Achenes strongly ciliate; pappus-crown prominent; involucre 



10-15 mm. broad. 3. L. cordifolia. 



Achenes minutely ciliate; pappus-crown minute or none; 

 involucre 5-12 mm. broad. 

 Pappus of a minute crown of squamellae and a single awn; 



leaf-blades with an open sinus. 4. L. Lloydii. 



Pappus wanting; leaf -blades with an acute narrow sinus. 5. L. grandi folia. 



Leaves very acutely lobed. 6. L. Palmeri. 



Leaves deeply 3-5 -cleft. 



Leaf-blades reniform in outline, mostly 5-cleft, with a few scattered long 



hairs, or glabrate, very thin; achenes glabrous on the faces. 7. L. lohata. 



Leaf-blades ovate or cordate in outline, mostly 3-cleft, puberulent with 

 or without long hairs. 

 Pappus-crown of squamellae present; achenes densely ciliate on 



the margins; leaves long-hairy as well as puberulent. 8. L trisecta. 



Pappus-crown represented by a callous margin; achenes sparingly 



short-ciliate on the margins; leaves merely puberulent. 9. L. gilensis. 



