110 



NORTH AMERICAN FLORA 



[Volume 34 



about 1 cm. high and 2 cm. broad; ligules 12-15 mm. long, 5-8 mm. wide; disk-corollas about 

 8 mm. long; achenes 3 mm. long; squamellae 7-8 mm. long, less than 1 mm. wide. 



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

 Distribution: Arizona and New Mexico. 



63. HYMENOXYS Cass. Diet. Sci. Nat. 55: 278. 1828. 



Picradenia Hook. Fl. Bor. Am. 1: 317. 1833. 

 Phileozera Buckl. Proc. Acad. Phila. 1861: 459. 



1862. 



Caulescent annuals, biennials, or perennials. Leaves alternate, commonly pinnatifid into 

 narrowly linear divisions, sometimes entire or merely lobed or few-toothed. Heads in ours 

 radiate, solitary on peduncles ending the branches. Involucre of two series of bracts, 5-16 in 

 each series, the outer usually narrower and more or less united at the base, rather firm, entire, 

 acute; the inner broader, either similar, or else more or less erose on the margin and abruptly 

 acuminate or mucronate. Ray-flowers 5-16, pistillate and perfect; ligules usually conspicuous, 

 3-lobed and 4-nerved, with the nerves connected in the lobes. Disk-flowers many, hermaphro- 

 dite, perfect; corolla-tube very short, much shorter than the cylindric or slightly funnelform 

 throat; lobes 5, glanlular-hispidulous. Style-branches obtuse or truncate, penicillate. Achenes 

 obpyramidal, 5-angled, densely hirsute with ascending hairs. Pappus of 5 hyaline squamellae, 

 with faint or indistinct midrib, usually acute or acuminate. 



Type species, Hyme?iopappns anthemoides Juss. 



Perennials or biennials; inner bracts fimbriate or erose, abruptly acute, 

 acuminate, or mucronate, unlike the outer ones; disk-corolla* not 

 expanded at the mouth. 

 Plant low, perennial, usually with a multicipital caudex; outer bracts 

 united at least one-third their length. 

 Plant long-hairy on the basal leaf-bases, usually decidedly cespi- 

 tose; squamellae usually more than half as long as the 

 corolla, acuminate, acute, or awn-tipped. 

 Outer bracts not strongly thickened on the back. 



Outer bracts united to the middle; free portions ovate or 



ovate-lanceolate . 

 Outer bracts united about a third their length; free portions 

 narrowly lanceolate. 

 Involucre 10-15 mm. broad; ligules 10-18 mm. long; 



plant 1-3 dm. high. 

 Involucre 8-10 mm. broad; ligules 5-8 mm. long; plant 

 less than 1 dm. high. 

 Outer bracts strongly thickened on the back, subcarinate. 



Heads few, often solitary; ligules nearly rectangular- 

 oblong. 

 Heads several; ligules decidedly cuneate. 



Basal leaves all or some of them dissected. 



Ligules light-yellow, at least twice as long as wide; 



pappus-squamellae aristate-pointed. 

 Ligules orange, half longer than wide; pappus- 

 squamellae acute or acuminate. 

 Outer bracts ovate, with broad margins; plant 



cespitose. 

 Outer bracts lanceolate; plant scarcely cespitose. 

 Basal leaves entire. 

 Plant not long-hairy at the base, scarcely cespitose; squamellae 

 rarely half as long as the corolla. 

 Leaves all or all except the middle ones entire. 



Leaves all entire, grass-like, glabrous; squamellae very 



short, blunt. 

 Leaves pale and canescent, the middle usually few-lobed; 

 squamellae long-acuminate. 

 Leaves mostly divided into linear-filiform divisions. 

 Bracts 8-12 in each series. 



Ligules 3-4 mm. long; outer bracts united to near the 



middle; plant very leafy. 

 Ligules 7-10 mm. long; plant not conspicuously leafy. 

 Outer bracts united to above the middle. 

 Outer bracts united for about one third their length. 

 Bracts usually 5 in each series. 

 Plant tall, biennial or short-lived perennials; outer bracts united 

 only at the base. 

 Leaves all dissected into narrowly linear divisions. 



Leaves of the stem very numerous, more or less lepidote-pubes- 

 cent; segments narrow, rarely more than 1 mm. wide. 



1. H. Richardsoni. 



2. H. macrantha. 



3. H. fumila. 



4. H. Macounii. 



5. H. floribunda. 



6. H. Earlei. 



7. H. Metcalfei. 



8. H. olivacea. 



9. H. Rusbyi. 

 18. H. subintegra. 



10. H. brachyactis. 



11. H. Vaseyi. 



12. H. Cooper i. 



13. H. quinquesquamata. 



