Duckweed

: Lemna

Duckwheat

: Fagopyrum

Dud Aim Melon

: Cucumis.

Dulichium

(old Latin name). Cyperaceae. One perennial species, D. arundindceum, Brit. (D. spatha-ceum, Pers.), in E. N. Amer., which has been offered by collectors as a bog-plant. It is grass-like, with terete leafy culms which are hollow and unbranched, 2-3 ft. tall; it has linear flattened spikelets sessile in 2 ranks on peduncles that arise from the leaf - sheaths. It is distributed in swamps about ponds from Newfoundland across the continent and to Fla. and Texas; of no special value.

Duraznillo

: Jatropha.

Dusty Miller

: Lychnis Coronaria; also species of Centaurea and Senecio.

Dutchman's Breeches

: Dicentra Cucutlaria.

Dutchman's Pde

: Arislolochia.

Duvalia

(for Duval, an early botanist). Asclepia-ddcese. About 20 succulent very dwarf leafless herbs, mostly of S. Africa, rarely seen in cultivation: stems decumbent or erect, sometimes subterranean and with the tips appearing above the surface, 4-6-angled and with spreading teeth, each of which bears a minute rudimentary If.: flowers solitary Or in small clusters or cymes, usually borne near the middle of the young stems; corolla rotate, deeply 5-lobed, with a cushion-like ring around the outer corona and supporting it; corolla-lobes linearlanceolate to ovate, folded longitudinally backward; corona double, from near the top of the staminal column, the outer one flat and entire and angled, the inner one with turgid more or less pointed lobes; stamens affixed in the base of the corolla, united into a tube around the ovary: fruit erect smooth follicles. Cult, of Stapeha and similar succulents. The species are essentially fancier's plants and apparently not in the trade.

Duvernoia

(J. G. Duvernoy, pupil of Tourne-fort, or G. L. Duvernoy, of Strassburg, writer on natural history). Acanthaceae. By some authors united with Adhatoda, which genus is by some included in Justicia. The genus comprises 15 or more herbs or shrubs: flowers single or in short spikes; calyx short, 4-toothed, the back lobe toothed or parted; corolla-tube short; limb labiate, the upper lip helmet-shaped and 2-toothed, the lower lip flat. The species seem not to be in the trade, although D. Dewevrei, DeWild, has been cult, in Belgium: it is a tufted herb, about 2 ft. high: leaves oblong, petiolate: flowers paniculate; upper lip of corolla white with red stripes and the lower greenish white; corolla about 1/2in. long. Congo.

Dyschoriste

(name refers to the scarcely divided or lobed stigma). Inch Calophanes. Acanthaceae. Fifty or more annuals or perennials of the tropics of Amer., Africa, and Asia, allied to Ruellia and Stro-bilanthes. None of them is apparently in regular cultivation They are plants with opposite mostly entire small leaves and blue or pale flowers in short-stalked cymes. D. nobilior, C. B. Clarke (D. Hildebrandtii, Lind.), is a free-flowering shrub, with a penetrating odor, and hairy branches: leaves elliptic, nearly 2 in. long, slightly crenulate: flowers purple-blue in many distant and dense axillary cymes; corolla less than 1/2in. long. Brit. Cent. Africa; recently cult, at Kew.