Part 2, 1915] CARDUACEAE : TAGETEAE 169 



A perennial, somewhat woody at the base; stems 1-2 dm. high, diffusely branched, decum- 

 bent, canescent with short crinkled hairs; leaves opposite or the uppermost alternate, 2-3 

 cm. long, pinnatifid into linear-filiform segments, entire or with a few similar lobes, canescent; 

 peduncles 2-5 cm. long; involucre turbinate, about 6 mm. high, 8-10 mm. broad; principal 

 bracts oval, round at the apex, with 3-5 conspicuous glands; accessory bracts oblong or ob- 

 lanceolate, obtuse, round on the back, three fourths as long; ray-flowers few; ligules orange, 

 oval, 7 mm. long, obtuse or retuse; disk-corollas 3.5 mm. long; tube poorly differentiated 

 from the cylindric-trumpet-shaped throat; achenes 3 mm. long, hirsute, flattened, somewhat 

 angled; pappus 3-4 mm. long. 



Type locality: "Nova Hispania" [Mexico]. 



Distribution: Coahuila and San Luis Potosi to State of Mexico. 



Illustration: Bot. Reg. 19: pi. 1602. 



9. ACIPHYLLAEA (DC.) A. Gray, Mem. Am. Acad. II. 4: 91. 



1849. 



Dyssodia § Aciphyllaea DC. Prodr. 5: 641. 1836. 

 Hymenatherum § Aciphyllaea A. Gray, PL Wright. 1: 115. 1852. 



Low undershrubs with thick woody caudex. Leaves linear-filiform, acerose, opposite or 

 alternate, crowded, usually with fasciculate ones in their axils. Heads radiate, subsessile. 

 Involucre deeply campanulate, calyculate; principal bracts 8-14, linear, united to near the 

 top; accessory bracts fewer, 4-8, linear-subulate distinct, about one third as long. Receptacle 

 minutely alveolate. Ray-flowers few, in one series, pistillate, fertile; ligules oblong. Disk- 

 flowers many; corolla- tube shorter than and scarcely differentiated from the subcylindric 

 throat; lobes short, triangular. Achenes clavate, terete, many-striate. Pappus in a single 

 series of about 20 squamellae, the alternate slightly smaller, each divided into 5 bristles, or the 

 smaller ones into only 3. 



Type species, Dyssodia acerosa DC. 



1. Aciphyllaea acerosa (DC.) A. Gray, Mem. Am. Acad. II. 4: 91. 



1849. 



Dyssodia acerosa DC. Prodr. 5: 641. 1836. 



Hvmenatherum acerosum A. Gray, PL Wright. 1: 115. 1852. 



Dyssodia fusca A. Nelson, Bot. Gaz. 47: 436. 1909. 



A suffruticose perennial; stems 1-2 dm. high, much branched; leaves opposite or alternate, 

 crowded, linear-filiform, acerose, 1-2 cm. long, with smaller ones fascicled in their axils; invo- 

 lucre 6-7 mm. high, 3-5 mm. broad; principal bracts obtuse, with two rows of rounded 

 glands; ligules yellow, 3-4 mm. long; disk-corollas yellow, 4 mm. long; lobes 0.5 mm. long; 

 achenes 3 mm. long; pappus 4 mm. long. 



Type locality: State of San Luis Potosi. 

 Distribution: Texas to Arizona, Zacatecas, and Hidalgo. 



10. SCHLECHTENDALIA Willd. Sp. PI. 3: 2125. 1804. 



Willdenowa Cav. Ic. 1: 61. 1791. Not Willdenovia Thunb. 1790. 

 Adenophyllum Pers. Syn. PL 2: 458. 1807. 



Perennial herbs. Leaves opposite or the upper alternate, pinnate. Heads radiate, pe- 

 duncled. Involucre campanulate, with a distinct calyculum; principal bracts 10-15, linear, 

 acuminate with long bristle-tips, and with 4 large glands near the apex; accessory bracts about 

 half as long, subulate, bristle-tipped, each with a single gland. Ray-flowers few, ligulate, pistil- 

 late and fertile; ligules crimson. Disk-flowers many; corolla-tube slightly gibbous at the base, 

 rather short, not well differentiated from and about equaling the trumpet-shaped throat; limb 

 unequally cleft, the lobes linear, long, equaling the tube and throat. Achenes clavate, obtusely 

 angled, strongly striate. Pappus double, each series of 5 squamellae, the inner linear-lanceo- 

 late, longer than the achenes, with strong midrib, scarious denticulate margins, 3-cleft apex, 

 and ending in a stout bristle, the outer very short, cuneate, merely erose. 



Type species, Willdenowa glandulosa Cav. 



