Choke-Cherry

: Prunus demissa (West) and P. virginiana (East).

Chondrobollea

(compounded from Chondrorhyncha and Bollea). A genus established to contain hybrids between these genera. See also Bolleo-Chondrorhyncha.

Chondropetalum

: hybrids of Chondrorhyncha and Zygopetalum; see those genera.

Chondrorhyncha

(cartilage and beak). Orchida-cese. Three species of S. American epiphytal orchids, practically unknown in the American trade. Cult, as for Odontoglossum crispum. They are short-stemmed herbs without pseudobulbs, and oblong, plicate, peti-oled Ivs., the simple scape bearing a single large, odd, yellowish flower C. Chestertonii, Reichb. f. (O.R. 11:305; 16:57), C. fimbriata, Reichb. f., and C. rosea, Lindl., are the species. Keep cool and moist. A garden hybrid is reported between C. Chestertonii and Zygopetalum Mackayi under the name of Chondropetalum Fletcheri. O.R. 1908, 56, f. 8. George V. Nash.

Chorisia

(Ludwig Choris, born 1795, artist of Kotzebue's expedition). Bombacacese. Spiny trees of S. Amer. (3 species), one of which is somewhat cultivated Leaves alternate, digitate, of 5-7 entire or serrate leaflets: flowers large, with 5 linear or oblong petals, the peduncles axillary or racemose; staminal tube double, the outer one short and with sterile anthers; ovary 5-loculed and many-ovuled: fruit a pear-shaped caps, with many silky seeds. C. speciosa, stem Hil., of Brazil, the "floss silk tree," is cult, in S. Calif., and is adapted to warm glasshouses. It is a medium-sized tree, allied to Ceiba and Bombax. leaflets lanceolate, acuminate, dentate: calyx irregular, shining outside, but silky inside; petals obtuse, yellowish and brown-striped at the base, pubescent on the back. The soft silk or cotton of the seed-pods is used for pillows and cushions, l H. B.

Christmas Flower

: Euphorbia pulcherrima.

Chrosperma

: Zygadenus.

Chrozophora

(Greek, color-bearing, on account of their use). Euphorbiacese. Dye-yielding herbs. Leaves alternate, stellate hairy: flowers monoecious; staminate calyx 5-parted, valvate; petals free; styles biparted; ovary 3-celled, 3-ovuled. - Nine, species chiefly of Old World deserts. C. tinctoria, Juss. (Croton tinctorius, Linn.), Turnsole, a Medit. annual, formerly used for its blue dye, is listed in some European catalogues.

Chrysocoma

: Linosyris.

Chrysodium

: Elaphoglossum.

Chrysogonum

(Greek-made name, golden knee or joint). Compositae. A few composites, of which C. virginanum, Linn., is a perennial yellow-Ad. plant of S. Pa. and south; sometimes cult, as a border plant. It blooms in spring or early summer on stems which become 1 ft. high, the heads being solitary and peduncled in the axils or some of them terminal: leaves opposite and basal, ovate and mostly obtuse, crenate. Prop, by creeping rootstocks and runners. Of little merit horticulturally.

Chrysopogon

: Sorghastrum.

Chrysosplenium

(name from golden and spleen, referring to some old medicinal tradition). Saxifragdceae. Golden Saxifrage. Low semi-aquatics, sometimes used in bog-planting. C. americanum, Schw., is a native plant creeping in mud. stems forking, bearing roundish or cor-date small mostly opposite leaves, with very small, nearly sessile, greenish, inconspicuous flowers Scarcely known in cult, and, except for wet places where a cover or carpet is wanted, of no value horticulturally.