128 MISSOURI BOTANICAL GARDEN. 
A very variable species, connecting with H#. robusta by 
the forms nearest the type specimen (Fendler, 786), and 
by the variety with #’. odontadenia and E. schizoloba; also 
by the Texan forms of that species with H. brachycera. E. 
brachycera and EH’. odontadeniaare scarcely more than sub- 
species of this. 
Specimens examined from New Mexico (Fendler, Santa Fé Creek, 
786, 1847; Bigelow, near El] Paso, 1282a; Wooton, White Mts., 614, 1897, 
very slender and tall) ; Arizona (Pringle, Huachuca Mts., 1889, pubescent, 
near EZ. odontadenia); Texas (Nealley, Limpia Cafion, 613 = 446, 1889) ; 
Mexico (? Mearns, San Luis Mtes., 155, 1892). 
Var. TRIFARIS Nn. var. 
Stems few to very many, low, 1 to 2.5 dm. high, more 
slender and sinuous, usually pubescent throughout, little 
branched; leaves broader, more triangular ovate ; involucre 
as in #. odontadenia ; seeds and capsule not seen. — Range 
of the species. — Plate 45. 
Specimens examined (Thurber, El Paso, Texas, 160, 1851; Bishop, S. 
Utah, 1872-4; Eastwood, Navajo Cajion, 1892, pubescent, close to 
Fendler, 786). 
-E. opontapEentA Boiss. DC. Prod. 157: 148. 1862. JZ. 
montana Engelm. Mex. Bound. 2': 192. 1859. (in part). 
Stems many, slender and sinuous, 1.5 to 2 dm. high; rays 
3 or sometimes 2 or the stem terminated by a single involu- 
cre; rays with few branches; stem leaves numerous, oblan- 
ceolate to ovate lanceolate, acute, short petioled, 7 to 15 mm. 
long, 2 to 5 mm. wide; umbel leaves broad ovate, acuminate 
or acute; floral leaves rhombic circular, 4 to 5 mm. in diam- 
eter ; involucres broad turbinate, pubescent, 2mm. high, 2.5 
mm. wide; glands ascending, triangular semilunate, dentate 
between the diverging horns, 1 mm. wide, .7 mm. long; 
bracts small; seeds oblong, with a prominent, conical car- 
uncle almost half as long as the seed; otherwise as in Z. 
montana. — Mountains near El Paso, Tex. — Plate 45. 
Specimens examined (Wright, El Paso, 1825, 1851-2; Wright, 661, 
1849, Tex.?). 
44 
