148 



NORTH AMERICAN FLORA 



[Volume 34 



Style-branches with short conic or obtuse 

 tips; receptacle merely puberulent; ac- 

 cessory bracts two thirds or three- 

 fourths as long as the involucre proper. 

 Bracts united to near the apex; squamellae 

 each with 5 bristles or the alternate ones 

 with only 3. 

 Squamellae with 1-3 bristles or awnless. 



Calyculum conspicuous; principal bracts not united 

 above the middle. 

 Accessory bracts not pectinately toothed; pappus 

 double; inner squamellae 3-cleft and awned, 

 the outer cuneate and muticous. 

 Squamellae in each series 5, ligules crimson. 

 Squamellae in each series 10; ligules yellow. 

 Accessory bracts pectinately toothed; squamellae 

 all 1-3-awned. 

 Calyculum wanting or inconspicuous, of few subulate 

 accessory bracts; if more conspicuous, then the 

 principal bracts united high up. 

 Plant not floccose; leaves pinnatifid or if entire linear- 

 filiform; heads peduncled. 

 Bracts 5, obovate, with membranous, colored, 



and erose margins, free to the base. 

 Bracts more than 5, narrower, more or less united. 

 Plant floccose; leaves entire, comparatively broad; 

 heads sessile. 

 Pappus double, the inner series of 5 awned squamellae, the outer of 

 numerous bristles. 

 Pappus of numerous distinct bristles only. 

 Heads radiate. 



Bracts with broad scarious erose tips; rays white; perennial herbs 



with a slender branched base. 

 Bracts with acute tips, not scarious; rays yellow; shrubs. 

 Heads discoid. 



Leaves well developed, all or most of them alternate; tube of the 



disk-corollas long. 

 Leaves scale-like, opposite; tube of disk-corollas very short. 



8. Boebera. 



9. aciphyllaea. 



10. schlechtendalia. 

 1 1 . Trichaetolepis. 



12. Dysodiopsis. 



13. Urbinella. 



14. Thymophylla. 



15. Gnaphaliopsis. 



16. NlCOLLETIA. 



17. Leucactinia. 



18. Chrysactinia. 



19. porophyllum. 



20. Lescaillea. 



1. ADENOPAPPUS Benth. PI. Hartw. 41. 1840. 



Tall herbs. Leaves opposite, serrate. Heads solitary, peduncled at the ends of the 

 branches. Involucre campanulate; bracts in one series, united high up. Receptacle convex, 

 naked. Ray-flowers few, ligulate, pistillate and fertile; ligules spreading, oblong, entire or 

 indistinctly 2-3-crenate. Disk-flowers many, hermaphrodite; corollas regular; tube glandular- 

 puberulent, nearly equaling and rather gradually enlarging into the cylindric throat; lobes 

 short, erect. Anthers obtuse, subtruncate at the apex. Achenes linear, glandular-punctate. 

 Pappus reduced to a crown, with 5 callous, truncate teeth. 



Type species, Andenopappus persicaefolius Benth. 



1. Adenopappus persicaefolius Benth. PI. Hartw. 41. 1840. 



A tall herb; stems terete, striate, glabrous; leaves linear-lanceolate, acuminate, 1-1.5 dm. 

 long, serrate, with numerous small glands on the lower surface, tapering at the base into short 

 petioles which are connate and sheathing at the base; peduncles about 5 cm. long, somewhat 

 enlarging upwards; involucre fully 1 cm. high and nearly as broad; bracts about 15, united to 

 near the triangular tips; ligules yellow, 10-12 mm. long, 3-4 mm. wide; disk-corollas greenish- 

 yellow, about 7 mm. long; tube and throat each about 3 mm., the erect oblong lobes about 

 1 mm. long; achenes 7-8 mm. long, less than 1 mm. thick; crown of pappus about 0.2 mm. long. 



Tvi'K locality: Margins of streams, Maravateo [Michoacan]. 

 Distribution: Hidalgo to Michoacan. 

 Illustration: E. & P. Nat. Pfl. 4 5 : /. 126, E. 



2. TAGETES L. Sp. PI. 887. 1753. 



Diglossus Cass. Bull. Soc. Philom. 1817: 70. 

 Enalcida Cass. Bull. Soc. Philom. 1819: 31. 

 Solenolheca Nutt. Trans. Am. Phil. Soc. II. 7: 



1817. 

 1819. 

 371. 



1841. 



Annual or perennial herbs. Leaves opposite, or the lower opposite and the upper alter- 

 nate, usually pinnate or pinnatifid, sometimes simple, conspicuously gland-dotted. Heads 



