FLOWERING PLANTS AND FERNS OF ARIZONA 1021 



129. LEONTODON. Hawkbit 



Low scapose perennial; leaves subentire to sinuate-pinnatifid, hispid; 

 scapes 1-headed; head rather small, yellow; achenes fusiform, taper- 

 ing into a slender beak equaling or shorter than the body, muriculate; 

 pappus of the outer achenes of short more or less united squamellae, 

 that of the other achenes of about 10 paleaceous-based, long-plumose 

 setae and about as many much shorter naked setae. 



1. Leontodon nudicaulis (L.) Banks ex Lowe, Cambridge Phil. Soc. 

 Trans. 4: 28. 1833. 



Orepis nudicaulis L., Sp. PL 805. 1753. 

 Leontodon hirtus L., Sp. PL ed. 2, 1123. 1763. 



Sacaton, Pinal County, in a lawn (Beckett 13084), probably not 

 established, summer. An occasional weed in the United States and 

 Canada, introduced from Europe. 



130. STEPHAXOMERIA 



Annual or perennial herbs; leaves linear to oblong, entire to pin- 

 natifid, those on the upper part of the stem usually greatly reduced; 

 heads small, usually panicled, rosy or flesh-color; involucre of several 

 equal phyllaries and some calyeulate bractlets, or more regularly 

 graduated; achenes columnar, 5-angled; bristles of the pappus 

 1-seriate, plumose at least above, often paleaceous toward the base, 

 sometimes connate into groups. 



Key to the species 



1. Involucre 9 to 13 mm. high, 10- to 20-flowered (2). 



2. Stems branched from the base, more or less spreading, leafy throughout with 



runcinate-pinnatifid leaves, the branchlets near the heads with greatly 



reduced, ovate, spinulose-toothed leaves; pappus brownish tinged, the 



bristles naked toward the base 1. S. parryi. 



2. Stems erect, usually branched only above, the leaves at base of the stem 



runcinate-pinnatifid, the upper leaves much reduced, linear, entire, the 

 heads thus naked-panicled; pappus bright white, the bristles plumose 



to the base 2. S. thurberi. 



1. Involucre o to 9 (rarely 10) mm. high, 3- to 9-flowered (3). 



3. Plants annual (4). 



4. Pappus of 4 to 6 lanceolate paleae, these plumose on the shorter aristiform 

 tip, not longer than the achene 3. S. schottii. 



4. Pappus of 5 to 18 bristles, these plumose above the middle, longer than 



the achene, often paleaceous-dilated at base 4. S. exigua. 



3. Plants perennial (5). 



5. Pappus brownish tinged, the bristles naked and merely scabrous toward 



the base 5. S. pafciflora. 



5. Pappus bright white, the bristles plumose to the base_ 6. S. texuifolia. 



1. Stephanomeria parryi A. Gray, Amer. Acad. Arts and Sci. Proc. 

 19: 61. 1883. 



PtUoria parryi Coville, Contrib. U. S. Natl. Herbarium 

 4: 144. 1893. 



Known in Arizona only by a collection at Kingman, Mohave 

 County, 3.300 feet (Lemmon in 1884). Southwestern Utah, north- 

 western Arizona, and southeastern California. May and June. 



