532 PROCEEDINGS OF THE AMERICAN ACADEMY. 



269, 450, not Z. triloha, Pers. — Higher peaks of S. Arizona, south of 

 Rucker Valley, Lemmon, coll. of 1881, in Huachuca Mts., Lemmon, 

 coll. of 1882, Prlngle (small-leaved form) ; also in Chihuahua in shaded 

 ravines and slopes of mountains, Pringle, nos. 755, 1310. The fertile 

 rays in this species necessitate its transfer to this genus, with which iu 

 fact it corresponds habitally quite as well as with Gymnolomia. 



•)- -t- Leaves crenate, serrate, or subentire, not lobed. 



■w- Leaves obtuse, pale above, canescent-tomentose beneath ; blades rather abruptly 

 contracted into winged petioles. 



= Rays about 1 cm. long : involucral scales canescent-tomentose. 



6. Z. MOLLissiMA, 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. Parri/, 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. 



7. Z. AUGUSTA, Sch. Bip. Shrub : leaf-blade ovate to lance-oblong, 

 usually crenate : involucral scales numerous, lanceolate, the outer acute, 

 subglabrate. — Flora, 1861, p. 562; Ilemsl. 1. c. 159 (excl. syn. Z. me- 

 gaceplialob). Ferdinanda augusta, Lag. Gen. & Spec. Nov. 31, t. 2. 

 F. lutescens, DC. Prodr. v. 553. Anthemis lutescens, Llav. & Lex. 

 Nov. Veg. Descr. i. 30. ChrgsopJuniia fastigiata, Kunth, in Less. 

 Syn. 224. — Apparently common in Central Mexico, near Guadelupe, 

 Bourgeau, no. 803, Bilimelc, no. 541 ; Chapultepec, Bilbnek, no. 542; 

 Rio Hondu Canon, Pringle, no. 3144; Queretaro, Berlandler, no. 1254; 

 near Guanajuato, Duges. 



4-t. *+ Leaves acute, deltoid-ovate or -lanceolate, abruptly contracted to winged 



petioles. 



8. Z. ASPERRiMA, Sch. Bip. Stem terete, glabrate : blade of lower 

 leaves dentate, of the upper subentire, 5 cm. long, 3 cm. 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, 

 5 ram. long. — Flora, 1864, 218. — Chapulco, Liebmann, no. 544. Type 

 number in herb. Gray. 



Var. montagnaefolia. Blades of even the upper leaves conspicu- 

 ously crenate-dentate. — Z. montagncefolla, Sch. Bip. I.e. 1861, p. 563; 



