382 GENTIANACEAE (GENTIAN FAMILY) 



sepals; these more or less enfolding the three small linear-lanceolate ones: 

 corolla blue or purplish, the tube equaling the calyx, a crown of setaceous fila- 

 ments at the base of its lobes. (<2. distegia Greene, Pitt. 4: 182. 1900.) Rare; 

 mountains of Colorado, Utah, and Wyoming. 



5. Gentiana strictiflora (Rydb.) A. Nels. Bot. Gaz. 34: 26. 1902. Stem 

 simple or branched, very strict, 1-4 dm. high: leaves often rather remote, 

 thickish, mostly lanceolate-linear, light green: flowers numerous, spicate- 

 thyrsiform on stem and branches, 4-merous: calyx-lobes unequal, mostly 

 shorter than the tube: corolla ochroleucous, sometimes tinged with blue, but 

 little longer than the calyx, 8-12 mm. long; the setae of the crown often few 

 or even wanting. G. Amarella stricta. Frequent; throughout our range. 



6. Gentiana plebeja Cham. Linnaea 1: 181. 1826. Stem simple or branched 

 from the base, slightly angular, 1-3 dm, high, the internodes often much 

 longer than the leaves: basal leaves oval-spatulate ; middle stem leaves oblong 

 or oblong-lanceolate, obtuse, 2-4 cm. long; the uppermost oblong-linear, 

 acute: flowers several in each axil, often on a short branch, more numerous 

 at summit: calyx deeply cleft, its longer linear lobes almost equaling the 

 corolla tube: corolla 12-18 mm. long, pale blue, the lobes fringed at base. G. 

 Amarella acuta. ( A mar ella scopulorum Greene, Leaflets 1 : 55. 1904; <7en&'o- 

 nella dementis Rydb. Bull. Torr. Bot. Club 31: 631. 1904.) Throughout our 

 range. 



6a. Gentiana plebeja Holmii Wettst. Oester. Bot. Zeitsch. 50: 195. 1900. 

 Slender and low, simple or nearly so, few-flowered. A reduced alpine state 

 of the species. 



7. Gentiana Romanzovii Ledeb. Nouv. Mem. Soc. Nat. Mosc. 1: 215. 

 1829. Stems 5-15 cm. high, often tufted, each 1-3-flowered : leaves linear, 

 varying to lanceolate or spatulate, thickish; the cauline 2-4 pairs, connate- 

 sheathing at base: calyx-tube obconical, the lobes somewhat unequal, about 

 half as long as the corolla: corolla funnelform, 3-4 cm. long, yellowish, often 

 streaked with blue, liberally spattered with purplish dots; the lobes short 

 and broad, the plaits entire and broad, only slightly extended at summit: 

 -seeds with a loose cellular coat having crested longitudinal ridges. G. frigida. 

 Alpine regions in the Rocky Mountains. 



8 Gentiana calycosa Griseb. Gent. 292. 1839. Stems erect, 1-3 dm. high: 

 leaves ovate, 15-30 mm. long, commonly equaling or exceeding the inter- 

 nodes, the lowest pairs smaller and with connate-sheathing base, the upper 

 hardly so; the uppermost involucrate and somewhat exceeding the calyx of 

 the commonly solitary flower: lobes of the calyx ovate or oblong, or even sub- 

 cordate, about as long as the turbinate tube: corolla blue, oblong-funnelform, 

 the appendages in the sinuses triangular-subulate, laciniate or 2-cleft at tip, 

 shorter than the broadly ovate lobes: seeds lanceolate, acuminate, wingless. 

 On the highest mountains; western Wyoming to California and Oregon. 



8a. Gentiana calycosa xantha A. Nels. 1. c. Leaves about 5 pairs, longer 

 than the internodes: flowers yellow or yellowish-white with numerous green 

 dots. Teton Mountains, Wyoming. 



9. Gentiana Parryi Engelm. 1. c. 218. Stems numerous from the crown of 

 a somewhat woody root, 1-3 dm. high: leaves glaucescent, thickish, ovate, 

 varying to oblong-lanceolate, 18-36 mm. long, most of the pairs with some- 

 what sheathing base; the upper two or three pairs invojucrate around the 

 1-5 flowers, concealing the calyx and sometimes almost equaling the bright 

 blue corolla: lobes of the calyx small, moderately or much shorter than the 

 campanulate tube: appendages in the sinuses of the corolla narrow, deeply 

 2-cleft, but little shorter than the obovate lobes: seeds lanceolate, wingless, 

 with obtuse or acutish edge. Alpine and subalpine in the Cascade' and 

 Rocky Mountains. 



9a. Gentiana Parryi bracteosa (Greene) A. Nels. Leaves narrower, the 

 floral ones thin ;m<l somewhat scarious: calyx-lobes small and inserted at the 

 base of the men ihnu ions summit of the tube. (G. bracteosa Greene, Pitt. 

 1: ISO. !'.)()(). )-- Colorado. 



10. Gentiana affinis Griseb. 1. c. 289. Stems clustered, 1-3 dm. high: 



