GENTIANACEAE (GENTIAN FAMILY) 379 



1-3 m. high, glabrous: leaves spatulate-oblong, obtuse or obtusely acuminate, 

 short-petioled, obtusely or obsoletely serrulate, 2-3 cm. long: fertile flowers 

 in sessile fascicles: drupe obtuse, short-oblong or ovoid. — Southern Colorado 

 to New Mexico and Texas. 



92. GENTIANACEAE Dumort. Gentian Family 



Smooth herbs with bitter, colorless j\)ice. , Leaves opposite, rarely alternate 

 or verticillate, without . stipules. Elowers perfect, regular. Calyx mostly 

 4-12-lobed or -toothed, often marcescent. Corolla sjrmpetalous, 4-12-lobed 

 or -toothed, convolute or imbricated and usually twisted in the bud, often 

 marcescent. Sta^mehs as many as the lobes of the corolla, alternate with them, 

 inserted on its tube; the 2-celled anthers opening longitudinally. Ovary 

 free, 1-celled, rarely 2-celled, with 2 parietal placentae, or the whole wall ovu- 

 liferous; style single, with usually 2-lobed or 2-lamellate stigma. Capsule 

 dehiscent through the- placentsie. Seeds indefinitely numerous, ra,reiy few, 

 commonly small. , 



Style filiform, deciduous; anthers recurved or twisted in age, 



'>GqroUa-tube exceeding the calyx . , 1. Erythraea. 



uprolla-tube shorter than the calyx 2. Eustoma. 



Style short and' persistent or wanting; the stamens remaining 

 straight. ' 

 CoroUa without nectariferous pits or large glands. 

 ,, Corolla rotate, with the stamens on its i base . . . .3. Pleurogyne. 



' Corolla not rotate, the stamens <^ its tube. 

 ^~' I ; 'Fjfowers solitary-terminal; anthers, versatile .... 4. Chondrophylla. 



Flowers cymose; anthers not versatile, 5. Gentiana. 



Corolla with 1 or 2 nectariferous pits or scales at the base of each lobe. 



Leaves not verticillate; style wanting 6. Swertia. 



Leaves verticillate; style evident . ' . . . . . .7. Frasera. 



1. ERYTHRAEA Neck. Centattrt 



Low and small branching annuals, chiefly with rose-purple or reddish 

 flowers. Calyx 4-5'-parted; the divisions slender. Corolla funnslform or 

 salverfttrm^ with slender tube and 4-5-parted limb. Anthers exserted, erect, 

 twisting spirally: Style Blender, single; stigma capitate or 2-lipped, 



,1, Erythraea arizonica (Gray) Eydb. Bull. Tori-, Bot. Club 33: 148. 1906, 

 P^jxicijlately or somewhat racemosely branched, 2-3 dm, high: leaves nar- 

 rowly objpng to lanceolate pr linear: pedicels as long as or longer than the 

 calyx: eorolla-tube longer than the calyx, its lobes obtuse and somewhat 

 shorter than its tube: seeds globular. , E. Douglasii. — Colorado to Uteh and 

 Arizona. ' 



2. EUSTOMA SaUsb. 



Glaucous, large-flowered annuals or perennials, with more or less clasping and 

 cotonate leaves, and slander temlinal audi more or less pamculate l-flowered 

 peduncles. Calyx 5 (rarely 6)-parted; its lobes long-acuminate, with carinate 

 midijb. ' Corolla campanulate-funnelform, deeply 5-6-lobed. Anthers objong, 

 versatile, straight or recurving in age. Stye fiuform, nearly persistent; stigma 

 (A 2 broad lamellae. 



1. Eustoma Andrewsii A. Nels. Proc. Biol. Soc. Wash. 17: 177. 1904. 

 Perennial from short, vertical, semifleshy roots, with a somewhat enlarged 

 crown or caudex; the old stems occasionally persisting; stems simple below, 

 more or less tasciculately branched above, 2-4 dm, high; leaves elliptic- 

 oblong below to lanceolate and acute above, mostly 3-nerved, 2-4 cm. long; 

 the next, year's crown leaves appearing in the autumn as rosettes which are 

 persistent and evergreen: peduncles ebracteate, 3^8 cm. long: calyx deeply 



