110 GENTIANACE^. Enwnja. 



6. EM6RYA, Torr. (In honor of Major, now General, W. H. Emory, the 

 U. S. Commissioner of the Mexican Boundary Survey in which the plant was 

 discovered.) — Single known species. 



E. suaveolens, Torr. Shrub 3 to 6 feet high, mucli branched, somewhat pulverulent or 

 puberulent : the leaves canescent beneath, somewhat deltoid or hastate, sinuate-dentate 

 with a few coarse teeth, obtuse, petioled, half inch or more long : inflorescence a nar- 

 row and pedunculate thyrsus or panicle: flowers pedicellate, loose and rather few, sweet- 

 scented : corolla over an inch long, " greenish-white or yellowish ; " the roundish lobes 

 only M, line or two long. — Bot. Me.x. Bound. 121, t. .36; Benth. & Hook. Gen. ii. 794. — 

 Caiions of the Rio Grande, Texas, below Presidio, Parry. 



Order XC. GENTIANACE^. 



Herbs, with bitter colorless juice, and (the Menyanthem excepted) with opposite 

 or rarely verticillate simple and entire sessile leaves, no stipules, perfect and reg- 

 ular flowers, persistent calyx and often marcescent corolla, the latter (with one or 

 two exceptions) dextrorsely convolute in the bud, a one-celled free ovary with 

 2 parietal many-ovuled placentae, or the whole parieties ovuliferous, single style 

 and usually 2-lobed or 2-lamellate stigma, and the capsule dehiscent through the 

 placentae. Seeds indefinitely numerous, or rarely few, anatropous, commonly 

 small, and with a minute embryo in fleshy albumen. Stamens, as in all the 

 related orders, borne on the tube or base of the corolla, as many as its lobes and 

 alternate with them : anthers in our genera 2-celled and opening longitudinally. 

 Style rarely cleft, at least the divisions stigmatose down the inner face of the 

 lobes. Plants almost all glabrous and smooth throughout, and the flowers cymose 

 or simpl}' terminal. Ovary in all our genera one-celled, or half two-celled by 

 introflexion of the placentae (in some exotic genera 2-celled). The Menyanthece 

 differ almost ordinally in the foliaffe and aestivation. Obolaria and Bartonia are 

 remarkable for the imbricated aestivation of the corolla : the sepals of the latter 

 are reduced to two : their lower leaves or scales are often alternate. 



Suborder I. GENTIANEiE. Leaves always simple and entire, sessile 

 (except some radical ones), never alternate, except in one Swertia. ^Estivation 

 of the corolla never valvate. 



# Lobes of the corolla convolute in the bud. 

 -i— Style filiform, usually deciduous from the capsule : stigma bilamellar or bicrural, but 

 the divisions at first often connivent as if united, the flowers being proterandrous : 

 seeds numerous, with a close and reticulated or foveolate coat. 



-H- Calyx 4-toothed and 4-angled : anthers cordate-ovate and unchanged in age. 



1. MICROCALA. Corolla short-salverform, bearing the 4 short stamens in its throat. 

 Stigma as if compressed-capitate, but of 2 fiabelliform lobes which at length separate. 



-H- 4-i- Calyx 5-12- (or in Erythrma sometimes 4-) cleft or parted : .anthers oblong to linear, 

 mostly twisting or curving in age : placentas more or less intruded. 



2. ERYTHRMA. Parts of the flower 5 or sometimes 4. Calyx-lobes narrow and 

 carinate. Corolla salverforra with either a short or rather hmg tube. Filaments slender : 

 anthers oblong or linear, commonly exserted, twisting spirally in one or two turns after 

 anthesis. Style filiform : stigmas from oblong to fiabelliform. Capsule from oblong-ovate 

 to fusiform. 



3. SABBATIA. Parts of the flower 5 to 12. Corolla rotate. Filaments filiform, rather 

 short : anthers Unear or elongated-oblong, soon arcuate, recurved, or revolute. Style 2- 

 clef t or 2-parted ; the lobes filiform, compressed-clavate or spatulate, introrsely stigmatose 

 for most of their length. Capsule globose or ovoid, thick-coriaceous or at first fleshy. 



