This section is from the book "The Standard Cyclopedia Of Horticulture Vol2", by L. H. Bailey. See also: Western Garden Book: More than 8,000 Plants - The Right Plants for Your Climate - Tips from Western Garden Experts.
(Atragene americana, Sims). Fig. 983. Trailing or sometimes climbing, 8-10 ft.: usually 4 trifoliate leaves from each node; leaflets thin, ovate, acute, toothed or entire, somewhat cordate: flowers solitary, blue or purple, nodding at first, 2-4 in. broad when expanded; 4 thin sepals, silky along the margins and veins; staminodes spatulate, narrow, scarcely half as long as sepals. May, June.
Woodlands, Va. to Hud-son Bay, west to Minn. B.M. 887. - introduced
1881. variety Columbiana, Gray. Sepals narrower and more pointed than in the type. Rocky Mts.
18. alpina, Mill. (Atragene alpina, Linn.). stems 3-5 ft., slender, with prominent joints becoming swollen with age: leaves once or twice ternate, with ovate or ovate-lanceolate leaflets, serrate or incised; many petal-like stamens, which are devoid of anthers; sepals 4, bright blue. Spring. N. W. N. Amer., Siberia to S. and Cent. Eu. B.M. 530 (as variety austriaca). Gn. 46:318; 57 p 481. R.H. 1855:321. L.B.C. 3:250. G.W.10,p.82!
Fig. 983. Achene of Clematis verticillaris. (XI)
H.W. 3, p. 16. - A very hardy climber, preferring a northern exposure. variety sibirica, Kuntze (variety alba, Hort. Atragene sibirica, Linn.). Flowers white or nearly so. B.M. 1951. L.B.C. 14:1358. R.H. 1855:321. Var occidentalis, Gray. Petal-like stamens very few, and often bearing rudimentary anthers. Rocky Mts.
19. Stanleyi, Hook. (C. Stanleyana, Hort.). Fig. 984. Erect robust herbs, 3 ft. high: leaves biternate; leaflets sessile or petioled, variable in size, cuneate, silky:
Fig. 984. Clematis Stanleyi. ( X 1/3) flowers 1-3 in. across, white to pink-purple; sepals becoming widely expanded; stamens yellow; styles becoming very plumose, white. July-Oct. Transvaal. introduced 1893. B.M. 7166. Gn. 39:76. G.F. 3:513 (adapted in Fig. 984). G.C. III. 8:327. G.M. 34:320-Suitable for greenhouse cultivation; in the northern states it is apt to winterkill if left unprotected.
20. Viticella, Linn. Climbing 8-12 ft.: leaves sometimes entire, but usually divided into 3 nearly entire leaflets: flowers 1 1/2-2 in. diam., growing singly on peduncles or sometimes in 3's; sepals 4, blue, purple or rosy purple, obovate, pointed, reflexed; stamens yellow: fruit with rather short glabrous tails. June-Aug. S. Eu. to Persia. R.H. 1860, p. 183; 1876:110; 1879:350 (vara.). B.M. 565. G. 22:310; 8:399. H.W. 3, p. 15. Lav. 7. -This is the type of one of the leading groups of garden clematises, and is one of the parents of the Jackmanii type of hybrids.
The following are garden varieties:
Variety albiflora, Kuntze. Flowers white.
Variety rubra, Hort. Flowers purple. - variety rubra grandiflora, Jackman, has larger bright crimson flowers and 6 sepals. F.S. 20:2053 (1783). F. 1872:265.
Variety kermesina, Lem. (C. kermesina, Hort.). Flowers of bright wine-red color, purple being absent. Gn. 39:30.
Variety lilacina-floribunda, Hort. (C. lilacina-floribunda, Hort. C. floribunda, Hort.). Flowers pale gray-lilac, conspicuously veined. Gn. 18, p. 389 (note). - An abundant bloomer. Produced in an English garden in 1880.
Lady Bovill, Jackman (C. Lady Bovill, Hort.). Flowers cup-formed, sepals being concave and little or not at all recurved at the ends, flowers 4 in. across; sepals 4-6, grayish blue; stamens light brown. M. & J. 15. R.H. 1876:190.
Variety marmorata, Jackman (C. marmorata, Hort.). Flowers rather small, with 4 broad sepals, light grayish blue with darker veins, 3
Clematis longitudinal bars. M. & J. 1, f. 2; same plate in F.S. 20:2050-55 (2008). F. 1872:265.
Hybrids of C. Viticella which are closely allied to that type:
(XC. integrifolia; C. Hendersonii, Henderson. C. Chandleri, Hort.) Fig. 985. stem and habit of C.Viticella: leaflets and flowers much like C. integrifolia: climbing 8-10 ft.: 4 blue sepals, spreading, reflexed at the tips. R.H. 1852: 341. F.S. 13:1364 (as variety venosa). Lav. 12. Here belong also: C. intermedia, B o n a m y, smaller, with more pubescent branchlets and paler flowers C. Bergeronii, Lav., resembling more C. integrifolia: leaves usually entire: flowers pink, about 2 in. across in terminal panicles. Lav. 10. C. distorta, Lav., with rosy-lilac twisted sepals. Lav. 11. C.Bos-koop, Hort. (C. Bos-koop Seedling, Hort.= C. V. XC. integrifolia). A new race in 1892: growing 3-5 ft.: flowers blue, lavender, rose or reddish rose.
Fig. 985. Clematis eriostemon. (X 1/6)
(XC. Flammula). Flowers in several- to many-flowered terminal panicles, pale violet, about 1 in. across; petals sometimes 6. Here belongs also: C. Othello, Cripps (=C. V. variety rubra X C. Flammula). Flowers
of medium size, of a deep velvety purple; continues blooming until Oct. - C. rubro-marginata, Jouin (C. Flammula variety rubro-marginata, Cripp.). Similar to C. Flammula; sepals white bordered reddish violet.
(XC. campaniflora; C. revoluta, Desf.). Flowers white, small, scarcely 1 in. across, sometimes larger: achenes with the tail usually pubescent at the base. A.P. De Candolle, PI. Rar. Geneve. 12. - Of no ornamental value.
C. venosa, Krampen (x C. florida; C. florida variety venosa, Lav.). Similar to C. florida, but petals obovate. Lav. 6. R.H. 1860, p. 183. G. 2:251. G.Z. 6:160. F.S. 13:1364. Here also belongs Louise Carriere; flowers lilac with paler veins. R.H. 1880:10 and several forms described by Carriere as C. contorta, C. atroviolacea and C. Viticella alba. R.H. 1879:350.
For other hybrids of this species see C. Guascoi, Lem., under C. patens, C. splendida under C. lanuginosa as form of C. Jackmanii.
Climbing, 10-15 ft.: flowers reflexed and bell-shaped as in the above type or more so, usually 1 in. or less diam., purple or whitish: fruit with short pubescent tail. June, July. Native of Portugal. L.B.C. 10:987. Gn. 31, p. 187. Lav. 8 -This has been called C. Viticella because of its close resemblance in flower, fruit and If.; but the leaves are often twice ternate, and the plant is much more slender in habit.