(Compounded of the genera Diacrium and Laelia). Orchidaceae. D. Veitchii, Hort., is a hybrid between Diacrium bicornutum and Laelia cinnabarina. Pseudobulbs fleshy: flowers 9 or 10, the segments white suffused with lilac, also showing a bronze tint derived from the Laelia parent.

Diamond Flower

: lonopsidium.


(two-stamened Olyra). Gramineae. A single species raised at Kew some 8 years ago from seed supplied by Sander but native country unknown: differs from Olyra in its twin spikelets and other characters, the upper one being male and the lower one female, the male flowers with 2 stamens. The species is D. bicolor, Stapf, a perennial densely tufted grass with erect culms bearing 1-3 lanceolate or lance-oblong leaves that are dark green above and violet-purple beneath.


(two stamens). Gesneriaceae. Dwarf warmhouse plants of tropical Amer. (about 20 species), allied to Dicyrta, Achimenes and Isoloma, and requiring similar treatment; differs from former two in having 5 distinct glandular parts to the disk rather than annular, and from Isoloma in the narrower parts of the disk, plants weak, flowers pale, white or purplish, and in the short or nearly globular anther-cells, and other features: summer-flowering. D. ochroleucum, Hook., has yellowish white flowers; corolla somewhat swollen at base: leaves ovate, acute, hairy, coarsely serrate, on hairy purplish erect stems 1-2 ft. high. Colombia. B.M. 4254. D. pictum is offered abroad, but its identity is in doubt; see Isoloma. L. H. B.


: Euphorbia.


(named in allusion to the 2-celled winged caps.). Acanthaceas. Pubescent or hirsute annual or perennial herbs or sub-shrubs, with red, violet or blue bracted flowers in terminal or axillary clusters, in the tropical parts of the world, 1 or 2 of which may sometimes occur in the trade. Leaves opposite, entire, the plant usually evergreen: corolla-tube, slender, often somewhat expanded above; limb 2-lipped, the lips narrow; stamens 2, on the throat. D. Niederleiniana, Lind., has been recently introduced abroad from Argentina: sub-shrub: leaves oval, to 3 in. long, petioled, rounded at apex, densely pubescent: flowers about 1 1/4 in. long, several crowded in a terminal paniculate cyme. D. Tweediana, Nees, of Uruguay, is a showy perennial with orange-red flowers and oblong-obtuse leaves There are probably 75 species of Dicliptera. Very likely the horticultural names are confused as between this genus and others. L, H B


: An ancient typographical error for Dielytra. See Dicentra.


: Coniogramme.


(twice curved, referring to structure of flowers). Gesneridceae. Very closely related to Achimenes with which some authors unite it, differing in the smaller flowers, and diverging anther-cells. Low-growing slender villous herbs with creeping roots: leaves opposite, membranaceous: flowers axillary, small, white or pale lilac, sometimes spotted; corolla-tube declinate, the limb oblique with 5 nearly equal spreading lobes; stamens affixed in the base of the corolla-tube, included, the anther-cells distinct. Two species occur in Guatemala. D. Candida, Hanst. & Klotzsch (Achimenes Candida, Lindl. Diastema gracile, Regel). To 1 1/2 ft.: leaves ovate to ovate-lanceolate, acuminate, serrate, 6hort-petioled: flower on a bracted pedicel that much exceeds the petiole, white, tubular-campanulate, the lowest lobe projecting. Summer. The other species is D. Warscewicziana, Regel (A. misera, Lindl.), apparently not in cultivation: flowers smaller. L H B