170 NORTH AMERICAN FLORA . [Volume 34 



1. Schlechtendalia glandulosa (Cav.) Willd. Sp. PI. 3: 2125. 1804. 



Willdenowa glandulosa Cav. Ic. 1: 61. 1791. 



Adenophyllum coccineum Pers. Syn. PI. 2: 458. 1807. 



Dyssodia coccinea Lag. Gen. & Sp. Nov. 29. 1816. 



Dyssodia Cavanillesii Lag. Gen. & Sp. Nov. 29. 1816. 



Boebera Cavanillesii Spreng. Syst. 3: 544. 1826. 



Dyssodia glandulosa O. Hoffm. in E. & P. Nat. Pfl. 4 5 : 266. 1890. Not D. glandulosa Cav. 1802. 



A perennial herb; stem sharply angled, 5-10 dm. high, glabrous, branched above; leaflets 



3-8, the upper lanceolate, 2-4 cm. long, sharply dentate with large oblong marginal glands, 



the lower teeth often tipped with long bristles, the lower leaflets much reduced, few-toothed, 



the teeth all bristle- tipped or the segments themselves reduced to long bristles; upper leaves 



of the branches wholly dissolved into bristles; peduncles 5-10 cm. long; involucre including 



the bristle-tips 2.5 cm. high, 10-12 mm. broad; ligules elliptic, 1 cm. long; disk-corollas fully 



1 cm. long, yellow tinged with crimson; tube about 2 mm. long; achenes 8 mm. long, striate; 



inner squamellae 12-13 mm. long, the outer 1.5 mm. long. 



Type locality: Mexico. 

 Distribution: Mexico. 

 Illustration: Cav. Ic. pi. 89. 



11. TRICHAETOLEPIS Rydberg, gen. nov. 



Slender annuals. Leaves pinnatifid with linear-filiform divisions, the lower opposite, 

 the upper alternate. Heads radiate. Involucre turbinate, with a calyculum; principal 

 bracts 8-12, oblanceolate, united about half their length, with scarious tips and 1-3 glands; 

 accessory bracts 5-7, linear-filiform, glandless. Receptacle small, conic, alveolate and fim- 

 brillate. Ray-flowers few, pistillate and fertile; ligules oblong, yellow, scarcely longer than the 

 pappus. Disk-flowers numerous; corollas yellow ; tube cylindric, somewhat shorter than and 

 poorly differentiated from the tubular throat; lobes linear or linear-subulate. Achenes clavate, 

 5-angled, silky-pubescent. Pappus double, of 10 squamellae in each series; outer squamellae 

 short, cuneate or spatulate, the inner elongate, 3-cleft and 3-awned. 



Type species, Adenophyllum Wrightii A. Gray. 



1. Trichaetolepis Wrightii (A. Gray) Rydberg. 



Adenophyllum Wrightii A. Gray, PI. Wright. 2: 92. 1853. 



Hymenatherum neomexicanum A. Gray, Proc. Am. Acad. 19: 40. 1883. 



Thymophylla neomexicana Wooton & Standley, Contr. U. S. Nat. Herb. 16: 191. 1913. 



Dyssodia neomexicana B. L. Robinson, Proc. Am. Acad. 49: 507. 1913. 



An annual; stem simple below, branched above, minutely puberulent or glabrate, angled 



and sulcate; leaves pinnatifid with 5-9 linear-filiform callous-pointed segments; upper leaves 



alternate, the lower opposite; heads in leafy corymbs; peduncles 2-4 cm. long; involucre 



turbinate, 7-8 mm. high, 8-10 mm. broad; principal bracts oblanceolate, obtuse or acute 



with fuscous scarious margins and 1-3 conspicuous glands; accessory bracts half as long; 



ligules 3 mm. long; disk-corollas 5 mm. long; lobes about 1.5 mm. long, sometimes tinged 



with purple; achenes 4.5 mm. long, densely hairy with ascending brown hairs; outer squamellae 



barely 1 mm. long, the inner 6-7 mm. long, dissected into 3 bristles. 



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

 Distribution: New Mexico and Chihuahua. 



12. DYSODIOPSIS (A. Gray) Rydberg, gen. nov. 



Hymenatherum § Dysodiopsis A. Gray, PI. Wright. 1: 115. 1852. 



Perennial herbs. Leaves opposite, narrowly linear, laciniate and spinulose-dentate with 

 one row of glands on each side. Heads ligulate, corymbose. Involucre campanulate, with a 

 distinct calyculum; principal bracts 10-14, more or less in two series, but all united to near the 

 apex, with irregularly disposed large glands; accessory bracts fewer, more or less pectinately 

 toothed, unequal in length, some nearly as long as the involucre proper, some not half as long. 

 Ray-flowers 5-8, pistillate, fertile ; ligules oblong, yellow. Disk-flowers many ; corollas greenish- 

 yellow with dark angles and lobes; tube shorter than the narrowly funnelform throat; lobes tri- 



