Part 2, 1915] CARDUACEAE: TAGBTEAE 171 



angular. Achcncs prismatic-clavate, 4-5-angled, striate, glabrous, tapering gradually down- 

 ward. Pappus simple, of 8-10 squamcllac, those- of the angles larger, all lanceolate or subulate, 

 awn-pointed, entire or some of them 3-cleft at the apex. 

 Type species, Dyssodia tagetoides T. & G. 



1. Dysodiopsis tagetoides (T. & G.) Rydberg. 



Dyssodia tagetoides T. & G. Fl. N. Am. 2: 361. 1842. 

 Hymenaihtrum tagetoides A. Gray, Mem. Am. Acad. IT. 4: 88. 1849. 

 Thymophylla tagetoides Small, Fl'. SK. U. S. 1295. 1903. 



A perennial, but evidently blooming the first year; stems single or several from the 



3-4 dm. high, glabrous or minutely puberulent; leaves 4-7 cm. long, narrowly linear, laciniately 



and spinulosely dentate with ascending teeth, the lower teeth bristle-like; heads corymbose; 



peduncles 1-3 cm. long, somewhat bracteate; involucre 6-7 mm. high, 5-17 mm. broad; 



principal bracts each with 2-8 conspicuous glands or the inner glandless, the free tips deltoid; 



ligules 6 mm. long, 3 mm. wide, yellow; disk-corollas 4.5-5 mm. long; achenes 4 mm. long; 



squamellae 1-2 mm. long. 



Type locality: Texas. 

 Distribution: Texas and Arkansas. 



13. URBINELLA Greenman, Proc. Am. Acad. 39: 117. 1903. 



Glabrous annuals. Leaves mostly alternate, simple and entire, subterete. Heads radiate, 

 solitary and peduncled at the ends of the branches. Involucre turbinate; bracts mostly 5, 

 obovate, free to the base, membranous and somewhat colored on the margins, with a single 

 large gland. Receptacle conic, naked. Ray-flowers 5, pistillate, ligulate. Disk-flowers 30-40, 

 hermaphrodite and fertile; corolla-tube slender, longer than the funnelform throat; lobes 5, 

 lanceolate. Anthers minutely toothed at the base, appendaged at the apex. Style-branches 

 with sublanceolate appendages. Achenes clavate, terete, many-striate. Pappus of 5-7 short, 

 obovate squamellae, some or none of them awned. 



Type species, Urbinella Palmeri Greenman. 



1. Urbinella Palmeri Greenman, Proc. Am. Acad. 39: 117. 1903. 



An annual, glabrous throughout; stem 0.5-2 dm. high, branched; leaves linear-filiform, 



0.5-2.5 cm. long, obtusish, with 1-3 conspicuous glands; involucre 5-6 mm. long, obscurely 



keeled; ligules white, obovate, 5-6 mm. long, nearly as wide; disk-corollas light-yellow, 3 



mm. long; achenes 3 mm. long, black, glabrous except the puberulent base; squamellae 



obovate-cuneate to lanceolate, usually 1 or 2 awn-bearing. 



Type locality: City of Durango. 



Distribution: Known only from the type locality. 



14. THYMOPHYLLA Lag. Gen. & Sp. Nov. 25. 1816. 



Hvmenathenun Cass. Bull. Soc. Philom. 1817: 12. 1817. 

 Lowellia A. Gray, Mem. Am. Acad. II. 4: 89. 1849. 



Annual or perennial herbs, in the latter case often suffrutescent at the base. Leaves 

 opposite, or alternate, or both, pinnately dissected into narrow lobes. Heads usually radiate, 

 peduncled. Involucre turbinate, campanulate, or hemispheric, with or without a few small 

 accessory bracts below; principal bracts in one or two more or less distinct series, equal in 

 length and more or less united, each with 1-5 glands towards the tip. Receptacle naked. 

 Ray-flowers pistillate and fertile, rarely wanting. Disk-flowers hermaphrodite, fertile; 

 corolla-tube very short, obscurely differentiated from the trumpet-shaped or narrowly funnel- 

 form throat; lobes ovate or triangular. Style-tips obtuse or truncate. Achenes clavate, 4-5- 

 angled, glabrous or hispidulous on the angles. Pappus of normally 10 (rarely 10-20) squam- 

 ellae most often in two series, those of the inner series usually elongate, 1-3-awned; those of 

 the outer awned as the inner, or unawned and much shorter; or, in 3 species, all short and 

 unawned. 



Type species, Thymophylla setifolia Lag. 



