306 Gentianaceae 
D. Corolla-lobes obtuse; seeds globose, 0.4—0.5 mm. long. C. E. (E. 
douglasii. ) C. exaltatum Wight (Tall Centaury) 
DD. Corolla-lobes acute; seed oblong, 0.6—0.7 mm. long. E. 
C. nuttallii (Wats. ) 
Erect or nearly so, annual or perennial. Leaves opposite or rarely whorled, entire, 
sessile or short-petioled. Flowers blue or purple or yellow or white. Calyx tubular, 
4—7-cleft but usually 5-cleft. Corolla tubular or clavate or campanulate or salverform 
or funnelform or rotate (not ours); lobes entire or fimbriate or erose. Style short or 
none; stigma cleft into 2 lamellae. (Honor of King Gentius of Illyria, who is said to 
have discovered the medicinal value.) 
A. Corolla plicate in the sinuses, the folds more or less extended into thin teeth; peren- 
nial. 
B. Corolla yellow; perennial by off-sets; anthers introrse. W. 
G. douglasiana Bong. (Yellow Gentian) 
BB. Corolla white or blue; root perennial; anthers extrorse. 
C. Stems 5—10 cm. long; stem-leaves 2—4 pairs. C. 
G. newberryi Gray (Dwarf Gentian) 
CC. Stems 15 cm. or more long; stem-leaves 6—many pairs. 
D. Upper leaves forming an involucre about the 1—5-flowered cluster. 
FE. Flower 1. W.C. E. (GC. gormani; G. bisetae.) 
G. calycosa Griseb. 
E22 welowers t—-5. =WaGek: 
G. parryi Engelm. 
DD. Upper leaves not forming an involucre. 
F. Corolla oblong-campanulate, its lobes narrowed at base, its appendages 
entire. 
G. Plant 3—6 dm. high; leaves lanceolate to linear, 3-veined; seed un- 
appendaged. U. (GC. orfordii.) 
G. menziesii Griseb. 
GG. Plant 6—12 dm. high; leaves ovate to lanceolate, 3—/7-veined ; 
seed with acuminate appendage. W. 
G. septrum Griseb. 
FF. Corolla funnelform, its lobes not narrowed at base, its appendages 
laciniate-toothed or -cleft. 
H. Stem 2—3 dm. high; leaves oblong to linear; bracts lanceolate to 
linear; calyx-lobes linear to narrowly lanceolate: corolla 2——2.5 cm. 
long. E. G. affinis Griseb. 
HH. Stem 3—6 dm. high; leaves ovate to oblong; bracts oblong to 
ovate; calyx-lobes oblong to ovate-lanceolate; corolla 3—3.5 cm. long. 
: G. oregana Engelm. 
AA. Corolla without extended plaits or lobes or teeth in the sinuses; annual. 
I. Corolla 25—50 mm. long, its lobes often fimbriate or erose. 
J. Calyx-lobes acutely keeled, 2 larger and narrower. E. (G. serrata halo- 
petala.) G. serrata Gun. 
JJ. Calyx-lobes not keeled, all about equal. C. 
G. simplex Gray 
II. Corolla 5—-7 mm. long, its lobes entire. 
K. Leaves 4—12 mm. long; calyx-lobes ovate to oblong; corolla 5-8 mm. long. 
jae G. tenella Rottb. 
