Gentiana. | GENTIANACEAE. 725 
C. Annual, slender, 3-14 in. high. Leaves mostig: 6 cauline. Flowers 4-kin. diam, Calyx- 
lobes linear-subulate. 
Stems weak, sparingly branched. Leaves oblong-spathulate, thin 4. G. Grisebachii. 
D. Perennial, rarely annual, erect. Radical leaves usually rosulate, crowded ; cauline 
few, in distant pairs, sessile. Flowers large, Zin. diam. or more, rarely less, in 
terminal cymes or umbels, rarely solitary. 
Annual. Flowering stems 6-12in., sometimes with decumbent 
branches from the base. Radical leaves 4-1} in., ovate or ovate- 
oblong, membranous. Flowers rather small, in involucrate 
umbels .. © 4.5 | Rs 5. G. chathamica. 
Annual. Flowering ators 9-18 in, ., Simple or ‘branched, Radical 
leaves usually rosulate, 1-44 in., obovate-oblong to spathulate, 
membranous ; cauline in remote pairs. Flowers in involucrate 
umbels .. a - i: ne o. .. 6. G. tenuifolia. 
Annual. Flowering stems simple, 8-l4in. Radical leaves few or ) 
many, $-2in., ovate or oblong-ovate, rather thin; cauline ’ 4 
leaves small. Flowers # in, 7. G. teriticaulis. / 
Perennial. lowering stems usually ‘single, often tall and stout, 
10-24 in. Radical leaves 3-14 in., obovate-spathulate ; cauline 
broadly ovate, often cordate at the base... 7 .. 8 G. montana. 
Perennial, much branched, forming sward-like patches. Flowering 
stems numerous, 3-Gin. Leaves narrow-spathulate or lanceo- 
late, dark-green. Flowers small,4—-4in. .. oh ty wi 
Perennial. Flowering stems usually single, very slender, 6—20 in. 
Leaves black when dry ; ; radical 4}-lin., ovate-lanceolate ; 
cauline 2-5 remote pairs .. .. 10. G. Townsoni. 
Usually perennial. Flowering stems single, less rarely branched 
from the base, stout, erect, "6-20in. Leaves yellow-green when 
dry; radical 13-4in., linear- or oblong-spathulate; cauline 
1-2 distant pairs, linear-oblong. Calyx short is .. LL. G. corymbifera. 
Habit of G. corymbifera, but much smaller. Flowering stems 
4-10in, high. Radical leaves few, $-l4in.: cauline 2-4 pairs. ores 
Flowers small .. » ‘* ue .. 12. G. serotina. 
Flowering stems 1 or several, often decumbent below, 5-20 in. 
Radical leaves 1-3 in., oblong- spathulate ; cauline 1-5 opposite 
pairs. Flowers in lax corymbose cymes or umbels .. .. 13. G. patula. 
Perennial; root long, slender. Flowering <tems 4-10i it ea 
decumbent below. MRadica] leaves numerous, crowded, 4-14 
oblong-spathulate, dark-green, polished and shining, ener.) 
Cauline leaves numerous. Flowers large, $2 in., 2—7-flowered 
umbels .. Ys .% ~3 .. 14. G. vernicosa., 
Flowering stems several, short, 1- 6 in, Radical leaves 4-14 in., 
spathulate or linear-spathulate. Flowers large, in 2—6-flowered 
cymes or solitary 5} 63 + . .. 15. G. bellidifolia. 
Apparently perennial; root stout. Flowering stems single or many. 
Radical leaves numerous, 3-1] in., thin and membranous, oblong 
to ovate. Flowers solitary, terminal, 3-2in. long... . 16. G. flaccida. 
Flowering stems excessively branched from ‘the base, often forming 
yauniod masses 2-6in. diam. Radical leaves 1-3 in., oblong or 
obovate-spathulate. Flowers in dense corymbose cymes .. IT. G. divisa. 
\~ 
. gracilifolia, 
~ 
~ 
HE. Perennial. . Stems numerous, variable in habit, erect or spreading or even entangled or 
traaling ; much branched, 6-12 in. or even 18 in. long. Leaves linear-spathulate. 
Flowers large, 4? in, 
Flowers freely produced, terminal, or axillary to the upper leaves. 
lalyx-lobes subulate te aos -: A | .. 18. G. Astoni. 
F. Annual, erect. Radical leaves numerous, rosulate, obovaie-spathulate ; cauline feu 
Y J ; 
petiolate. Flowers in 2—5-flowered involucrate umbels. 
Flowering stems several, 4-10in. Flowers small, 4-}in, diam. 
Calyx equalling the corolla or nearly so a re ~. 19. G. Spencer. 
