164 NORTH AMERICAN FLORA [Volume 34 



some of the teeth with long bristle-points; glands large, marginal in the rounded sinuses and 

 nearly terminal in the lobes; heads corymbose-paniculate, with more leafy peduncles; involucre 

 turbinate, 10-12 mm. high and nearly as broad; accessory bracts 15-20, pectinately divided 

 into 3-6 pairs of bristle-like divisions; principal bracts about 20, acuminate, the horn 1 mm. 

 long; ligules wanting or small, ascending, oblong; disk-corollas 5 mm. long, the cylindric 

 tube and the trumpet-shaped throat subequal, the lanceolate lobes somewhat shorter; achenes 

 5 mm. long, striate; squamellae 6-7 mm. long, all dissected into 7-10 bristles. 



Type locality: "Nova Hispania" [Mexico]. 



Distribution: Vera Cruz to Jalisco and Guatemala. 



Illustration: Cav. Ic. pi. 225. 



7. CLOMENOCOMA Cass. Diet. Sci. Nat. 9: 416. 1817. 



Comaclinium Scheidw. & Planch.; Planch. Fl. Serres 8: 19. 1852. 



Perennial herbs, usually woody at least at the base; or low shrubs,. Leaves opposite or 

 alternate, pinnate or apparently simple, in the latter case the lower segments usually being 

 reduced to subulate or setiform lobes on the petioles. Heads radiate, at the ends of elongate 

 terminal peduncles. Involucre turbinate or hemispheric, with a calyculum; principal bracts 

 many, narrow, usually with a terminal gland and a row of lateral ones on each side; accessory 

 bracts well-developed, about half as long as the involucre. Receptacle favose with more or 

 less developed subulate fimbrillae (chaff). Ray-flowers several, pistillate and fertile; ligules 

 mostly orange, oval to oblong. Disk-flowers numerous, hermaphrodite and fertile; corollas 

 elongate; tube more or less gibbously enlarged at the base forming a short collar, thence 

 narrow and cylindric, gradually tapering into the trumpet-shaped throat; lobes long, lanceo- 

 late. Style-branches tapering into a long subulate appendage. Achenes clavate, strongly 

 striate, glabrous or minutely pubescent, not flattened. Pappus of 10-15 squamellae, each 

 dissected into 5-10 bristles. 



Type species, Aster aurantius L. 



Leaves opposite, rather soft. 



Leaves mostly simple, serrate, at most with some small subulate divisions 

 below the terminal lobe. 

 Accessory bracts oblong or lanceolate. 1. C. grandiflora. 



Accessory bracts narrow, linear or subulate. 2. C. montana. 



Leaves pinnately 3-7-foliolate with suborbicular to ovate leaflets. 

 Leaflets 3, rarely 5, distinctly petioled. 



Leaflets ovate; accessory bracts with ovate acuminate scarious 



appendages. . 3. C. squarrosa. 



Leaflets suborbicular; accessory bracts subulate without append- 

 ages. 4. C. speciosa. 

 Leaflets mostly 5, ovate, the lateral ones subsessile. 5. C. aurantia. 

 Leaves mostly alternate, sub-coriaceous. 



Leaves simple, ovate, subsessile, saliently serrate. 6. C. Cooperi. 



Leaves, at least the lower ones, 3-divided or 3-cleft, laciniate. 



Plant puberulent; bracts attenuate. 7. C. laciniata. 



Plant glabrous; bracts acute or mucronate. 8. C. porophylloides. 



1. Clomenocoma grandiflora (Moc. & Sesse) Rydberg. 



Dyssodia grandiflora DC. Prodr. 5: 640. 1836. 



Boebera grandiflora Moc. & Sesse; DC. Prodr. 5: 640, as synonym. 1836. 



A tall herb; stem 3-10 dm. high, glabrous or sparingly hirsutulous, angled, striate; leaves 



opposite, practically simple, the lateral segments being reduced to small subulate lobes or 



bristles on the short petiole; blades ovate, 3-5 cm. long, acute or short-acuminate, serrate, 



sparingly hirsute above, glabrate except the midrib beneath; heads solitary at the ends 



of the branches; peduncles 1-2 dm. long, with a few small bracts; involucre hemispheric, 12 



mm. high, 20-25 mm. broad; principal bracts 12-15, oblong or elliptic, obtuse, with 2-4 irregular 



rows of glands, erose-dentate at the apex; accessory bracts 4-8, oblong to oblong-ovate, about 



half as long, acute; ligules fully 1 cm. long, elliptic, rather strongly- veined ; disk-corollas strongly 



veined, 12 mm. long; tube glandular at the junction with the trumpet-shaped throat; lobes 



linear-lanceolate, 2.5 mm. long; achenes 2.5 mm. long, pilose; squamellae about 10, 8 mm. 



long, each dissected into 8-11 slender bristles. 



Type locality: Mexico. 



Distribution: Southern Mexico and Guatemala. 



