. ~ ite * 4 
532 PROCEEDINGS OF THE AMERICAN ACADEMY. 
269, 450, not.Z. triloba, Pers. — Higher. peaks of S. Arizona, south of 
Rucker Valley, Lemmon, -coll.-of 1881, in. Huachuca Mts., Lemmon, 
coll. of 1882, Pringle (small-leaved form) ; also.ins {@hikuahua i in shaded 
ravines and slopes of niountains, Pringle, ' nos. 155, 1310. The fertile 
rays in this species necessitate its transfer :to this. genus, with which in 
fact it corresponds habitally quite as well as. with: Gymnolomia. 
+ + Leaves crenate, serrate, or subentire, not lobed. 
++ Leaves obtuse, pale sh) canescent-tomentose beneath ; blades rather abruptly 
racted into winged petioles 
= Rays about 1 cm. long: involucral scales canescent-tomentose. 
6. Z. moxuissmma, Gray. Shrub: leaf-blade ovate, subentire: invo- 
_ lucral scales (not very numerous) ovate-oblong, obtuse, white with per- 
_manent tomentum. — Proc. Am. Acad. xv. 35; Hemsl. Biol. Cent.-Am. 
‘Bot. ii. 160. — North Mexico, in fields near San Miguel, San Luis Potosi, 
Schaffner, no. 342; between San Antonio, Texas, and San Luis Potosi, 
C. C. Parry, nos. 35, 446; also on Mt. Orizaba, at 2,700 m. altitude, 
Seaton, no. 286. 
= = Rays 5 to 7 mm. long: involucral scales puberulent, green. 
eh 7. Z. aucusta, Sch. Bip. Shrub: leaf-blade ovate to lance-oblong, 
usually crenate: involucral scales numerous, lanceolate, the outer acute, 
subglabrate. — Flora, 1861, p. 562; Hemsl. 1. c. 159 (excl. syn. Z. mé- 
gacephala). Ferdinanda augusta, Lag. Gen. & Spec. Nov. 31, t- 2 
F. lutescens, DC. Prodr. v. 553. Anthemis lutescens, Liav. & Lex. 
Nov. Veg. Deser. i. 30. Chrysophania fastigiata, Kunth, in Less. 
Syn. 224.— Apparently common in Central Mexico, near Guadelupé, 
Bourgeau, no.803, Bilimek, no. 541; Chapultepec, Bilimek, no. 542+ 
Rio Hondu Cafion, Pringle, no. 3144; eaten pci ai 
near Guanajuato, Duges. 
++ ++ Leaves acute, deltoid-ovate or -lanceolate, abruptly aaeaded to winged 
petioles. 
8. Z. asperrimA, Sch. Bip. Stem terete, glabrate: blade of lower 
leaves dentate, of the upper subentire, 5 cm. long, 3 em. broad: fastigi- 
ately branched corymbose panicle leafy-bracted: heads (exclusive of the 
rays) ovoid-conical, 7 to 9 mm. in diameter: rays 8 to 10, broadly oblong, 
_ 5mm. long.— Flora, 1864, 218. — Chapulco, Liebmann, no. 544. Type 
fe number in herb. Gray. 
oe ". montagneefolia. Blades of even the upper leaves conspicu- 
—Z. Sana: ct Sch. Ge ie 1861, p. 5635 
