456 PROCEEDINGS OF THE AMERICAN ACADEMY. 



It will be noticed that a few species are herein treated which have not 

 as yet been reported from Mexico or Central America. In these cases 

 the known locality is such that the occurrence of the species may be ex- 

 pected in Northern Mexico. Besides the material in the Gray Her- 

 barium, the writer, through the kindness of Dr. J. N. Rose, has been 

 permitted to borrow from the U. S. National Museum for examination 

 the Mexican and Central American specimens of these two genera. 



G-ALiIUM, Linn. (Name from ancient Greek ydXiov, supposed to 

 be Galiion verum, and derived by Dioscorides from ydXa, milk, which it 

 was used to curdle.) Flowers perfect, polygamo-dioecious, or unisexual, 

 exinvolucrate. Calyx-tube ovoid or globose ; limb obsolete. Corolla 

 rotate, usually 4-lobed (not unfrequeutly 3-lobed, and rarely o-lobed) ; 

 lobes valvate. Stamens of the same number and alternating with the 

 lobes of the corolla, adnate to the base of the tube : anthers on short fila- 

 ments, exserted. Disk annular. Ovary 2-celled ; styles more or less 

 2-cleft; stigmas capitate ; ovules solitary in the cells, borne on the dis- 

 sepiment, amphitropous. Fruit didyraous, dry, subcarneous, or distinctly 

 baccate, smooth, tuberculate, or hispid, separating into closed carpels, or 

 only one carpel maturing. Seeds concave on the face ; embryo curved ; 

 cotyledons foliaceous ; radicle inferior. — Annuals, herbaceous perennials, 

 or rarely suflfruticose plants. Leaves in whorls of 3 to many. Flowers 

 u>iually disposed in axillary or terminal cymes, occasionally simply 

 axillary, or terminal, white, yellow, greenish, or purplish. — Gen. 24; 

 Benth. & Hook. f. Gen. ii. 149 ; Gray, Syn. Fl. N. A. i. pt. 2, 35 (excl. 

 § Relbunium ill part) ; Schumann in Engl. & Prantl, Nat. Ptlauzenf. iv. 

 Ab. 4, 149. For generic synonyms, which relate chiefly to the Old 

 World, see Hooker f. & Jackson, Index Kewensis, i. pt. 2, 991. 

 § 1. Fruit uncinate-liispid, or granular-papillo.se. 



* Leaves in whorls of six or eight (rarely of ten or more) ; the angles of the stem 

 as well as the midrib and margins of the leaves usually retrorsely aculeolate- 

 hispid, less frequently smoothish, or rarely (in G. triflorunt) somewliat hirsute. 



^- Stems smoothish, or rarely somewhat hirsute-pubescent. 



G. TRiFLORUM, Michx. Herbaceous : stems more or less pubescent : 

 leaves elliptic-lanceolate to narrowly oblong-lanceolate, cuspidate-acumi- 

 nate, 1.5 to 4 or rarely 8 cm. long, 5 to 10 or rarely 15 mm. broad, 

 usually covered on the upper surface near the margin with snbappressed 

 hispidiilous hairs, often slightly hispid on the midrib, otherwise glabrous : 

 inflorescence cymose, terminal, usually 3-flowered. — Fl. i. 80 ; Willd. 

 Hort. Berol. t. 66; DC. Prodr. iv. 601; Torr. & Gray, Fl. ii. 23; 



