A. Sepals upright, forming a tubular or urceolate flower; stamens upright, oppressed, pubescent; or sepals more spreading and flowers with petaloid staminodes. B. Flowers without petaloid staminodes. C. Leaves simple: herbaceous, not climbing. D. Color of flowers purple or blue.

e. The leaves thin, acute, sessile ... 1. integrifolia ee. The leaves subcoriaceous, reticulate, obtusish, short-petioled.................... 2. Fremontii dd. Color of flowers yellow........... 3. ochroleuca cc. Leaves compound.

d. Lfts, entire: flowers solitary. E. Plants upright, herbaceous. F. Shape of lfts, lanceolate: leaves bipinnate or ternately compound............. 4. Douglasii ff. Shape of lfts, ovate: leaves

pinnate............... 5. aromatica ee. Plants climbing, shrubby. F. Styles not plumose in fruit G. The leaves not reticulate, usually with terminal

Ift................. 6. crispa gg. The leaves reticulate, usually without terminal If t .............. 7. Simsii

FF. Styles plumose in fruit

g. Flowers axillary, with the pedicels much longer than the flowers H. Sepals outside pubescent, dull. I. Lfts, subcoriaceous, reticulate........ 8. reticulata

11. Lfts, membranous, indistinctly veined. 9. Viorna hh. Sepals outside glabrous, bright scarlet. .10. texensis GG. Flowers terminal and axillary, the latter with the pedicels shorter than the flowers..............11. fusca

DD. Lfts, serrate: flowers usually clustered or panicled. e. Plants herbaceous, upright: flowers clustered, often nearly sessile. F. Flowers blue or violet, in axillary clusters.......12. heracleaefolia ff. Flowers whitish, usually in an elongated terminal panicle...................13. stans ee. Plants climbing, shrubby. F. Leaves pinnate.

g. Flowers yellowish white, in panicles.............14. nutans gg. Flowers reddish purple, 1-8, axillary.............15. lasiandra

FF. Leaves bipinnate; lfts, small, deeply lobed, usually less than 1 in. long: flowers

whitish................16. aethusifolia bb. Flowers with petaloid staminodes; sepals more or less spreading; stamens upright, oppressed pubescent. c. Leaves always 3-foliolate; lfts, ovate, subcordate...................17. verticillaris

CC. Leaves partly biternate; lfts, ovate to ovate-lanceolate...............18. alpina

AA. Sepals spreading; stamens more or less divergent. b. Stamens glabrous or only with a few hairs below the anthers (or hairy at the base only in No. 19). C. Flowers solitary or in S's or in axillary fascicles, blue, violet, red or white, usually large. d. Lfts, entire: flowers on the new growth after the leaves, solitary or in 3's.

E. Plant herbaceous, upright: sepals imbricate in bud; stamens pubescent at the base........... ..........19. Stanleyi

EB. Plants woody, climbing: sepals valvate; stamens glabrous.

F. Achenes with short style; pedicels longer than the sepals.

G. Number of sepals 4: flsopen campanulate, usually 1-2 in. across.

H. Style glabrous: flowers 1-2 in. across, often in

S's...............20. Viticella

EH. Style pubescent except at the apex; flowers 1 in. or less across.... 21. campaniflora

GO. Number of sepals usually 5-6: flowers flat,

2-4 in. across........22. florida

FF. Achenes with long plumose style. G. Pedicels shorter than sepals: leaves simple or ternate..............23. lanuginosa

GG. Pedicels longer than sepals: flowers from last year's wood in spring or early summer: leaves ternate or pinnate .... 24. patens dd. Lfts, or leaves serrate: flowers in axillary clusters, or solitary on last year's branches with the leaves in spring, white or pink. B. The sepals with a small involucre below their base; flowers nodding, open campanulate. p. Leaves simple: flowers whitish.. .25. cirrhosa FF. Leaves ternate: flowers greenish yellow, spotted red inside.26. balearica EE. The sepals without involucre. P. Leaves pinnate; lfts, small, about 1/2. in. long.......27. gracilifolia

FF. Leaves ternate; leaflets 1-3 in. long. G. Lfts, glabrous or sparingly pubescent......28. montana gg. Lfts, densely silky pubescent beneath, less so above...............29. Spooneri cc. Flowers in terminal or axillary panicles or cymes, rarely 3 (if solitary, with bracts about the middle of the pedicel) white, rarely pinkish; sepals 4 (sometimes 4~6 in No. 37), usually small (except in No. 37). D. Leaves 3-foliolate; lfts, always entire, often sub-coriaceous or coriaceous. e. The flowers from the old wood from scaly buds..........30. Armandii

EE. The flowers from the new growth. f. Lfts, ovate or ovate-oblong. g. Filaments as long or shorter than anthers: lfts, rounded or subcordate at the base. . . .31. Meyeniana GG. Filaments longer than the anthers: lfts, cuneate at the base.......32. crassifolia

FF. Lfts, narrow-lanceolate or oblong-lanceolate........33. Pavoliniana dd. Leaves pinnate or bipinnate (if 3-foliolate, lfts, lobed or dentate or flowers diaecious). E. The flowers perfect.

f. Lfts, entire or nearly entire, or 3-lobed: anthers linear, much longer than broad. g. Plant herbaceous, upright................34. recta gg. Plant climbing, half-woody.

H. The leaves pinnate.....35. paniculata hh. The leaves bipinnate... . 36. Flammula

FF. Lfts, serrate, occasionally nearly entire: anthers oval or oval-oblong, not more than twice as long as broad (longer in Nos.

37 and 38).

g. The flowers 1-3, long-stalked,

2 - 3 in. across: leaves

pinnate..............37. Fargesii gg. The flowers in panicles or cymes, not exceeding

1 in. diam.

H. Leaves ternate or biternate: flowers 1/2in.

across, in many-fid.

cymes.............38. apiifolia

HH. Leaves usually bipinnate; lfts, ovate-lanceolate: tails of fruit about 3/4in. long. . .39. brevicaudata HHH. Leaves pinnate: tails longer. I. Sepals glabrous inside: lfts, pubescent beneath......40. grata n. Sepals pubescent inside and outside: lfts, glabrous or nearly so........41. Vitalba ee. The flowers dioecious.

F. Foliage deciduous: sepals 4G. Flowers appearing on the young wood in summer, less than 1 in. across.

H. Leaves ternate; leaflets 2 - 3 in. long...........42. virginiana

HH. Leaves pinnate; leaflets 1 - 2 in. long. I. Plant glabrous: lfts, rounded or subcordate at the base 43. ligusticifolia n. Plant pubescent: lfts, truncate or cuneate at the base___44. Drummondii

GG. Flowers on last year's branches from scaly buds in early spring,

1 1/2 in. across........45. lasiantha ff. Foliage evergreen; leaves ternate: sepals 5-7........46. indivisa bb. Stamens pubescent; flowers yellow or yellowish, nodding: achenes with plumose tails. c. Leaves pinnate or bipinnate.

d. Flowers usually several, 1-2 in. across, pale yellow: leaves bluish or grayish green; lfts, usually entire, often lobed. B. Lfts, often oblong or lanceolate: sepals pubescent inside....................47. orientalis

EE. Lfts, usually ovate or oval, pale bluish green: sepals glabrous inside............48. glauca dd. Flowers solitary, 2-3 in. across, on stalks to 10 in. long; sepals glabrous inside: lfts, usually lanceolate, serrate, green.....49. tangutica cc. Leaves biternate; lfts, serrate, green: flowers solitary..................50. serratif olia