468 PROCEEDINGS OP THE AMERICAN ACADEMY. 



* Involucres 2-flowered. 



1. N. biflora, O. Kuntze, Rev. Gen. i. 354 (1891), as Noccaea. 

 Lagascea biflora, Hemsl. Diag. PI. Nov. 33 (1879), & Biol. Cent.- Am. 

 Bot. ii. 13'.', t. 44 (1881). — Mexico, without locality, Parkinson, Salina 

 Cruz, C. C. Deam. 



* * Involucres 1-flowered. 



■<- Shrubs or perennial herbs : Mexican, 

 ■w Flowers large: glomerules sessile or scarcely peduncled, even in age more or 

 less campanulate, the Bubtending bracts ovate to lanceolate, large and conspic- 

 uous: central and southern .Mexico. 



= Leaves cordate-clasping at the sessile base. 



2. N. heltanthifolia, Cass. Stem pilose: leaves scabrous above, 

 Bcabro-hirtellous beneath. — Diet. Sci. Nat. xxv. 104 (1822), as Noc- 

 caea. Lagascea helianthifolia, HBE. Nov. Gen. & Spec. iv. 25 (1820). 

 L. macrophyUa, Zucc. ace. to Steud. Nomen. ed. 2, ii. 4 (1841). 

 Noccaea macrophylla, Zucc. ace. to DC. Prodr. v. 92 (1836). Acapulco, 

 Mi rico, Humboldt &, Bonpland; Jalisco, Rio Blanco, Palmer, no. G64 

 (coll. of L886) ; Guadalajara. Pringle, no. 1824, in part. 



Var. levior. Stem pulverulent-puberulent, destitute of the long 

 spreading pilosity characteristic of the typical form: leaves scabrous 

 above, scabrous-hirtellous beneath. — Colima, Mexico, Dr. Edw. Palmer, 

 no. 1148 (coll. of 1891) ; Zopelote, Tepic, altitude 615 to 924 m., Lamb, 

 no. 561. 



Var. suaveolens. Stem pilose ; leaves soft-pubescent beneath. — 



Lagascea suaveolens, IIBK. 1. c. (1820). Noccaea suaveolens, Cass. I. c. 



105 (1822). Nocca latifolia, Cerv. in La Llav. & Lex. Nov. Veg. 



i. 31 (1824). Lagascea latifolia, DC. Prodr. v. 92 (1836). — Tamau- 



lipas, Santa Barbara, Berlandier, nos. 753, 2173 ; Guanajuato, Duges 



(a form resembling the type) ; Oaxaca, Nelson, no. 1804, L. C. Smit/t, 



DO. 964 : ConzatH & Gonzalez, no. 558, llolway, no. 3724; 1'uebla, 



Conzatti, do. <s61 ; Vera Cruz, Mirador, Liebmann, no. Ill; Orizaba, 



Schaffner, Bourgeau, no. 3342, Botteri, no. 499, Gray, Tantoyuca, 



Ervendberg, no. 317; Chiapas, Ghiesbreght, nos. 146, 571 (form with 



- exceptionally pubescent almost lanate beneath); Guatemala, J. D. 



Smith's nos. 2410, 4227. 



I. avea Bhort-petioled, ovate, 2 or .1 times as long as broad: flowers red or 



purple. 



". Indumentum of the stem spreading, dense, uniform in length, partially glandu- 

 lar: Leaves elliptic, obtusish, remotely denticulate. 



8. N. N. BP. [?]. Branches Iignesccnt. covered throughout by a line 



dense spreading pubescence, a part of the hairs glandular, others of 



