Didiscus

: Trachymene.

Didymoplexis

(double or twin plaits). Orchidaceae. One saprophytic orchid with leafless stems D. pollens, Griff., has been cult, abroad but is probably not in the trade: root branching and tuberous, bearing a stem 4-6 in. high with loose sheaths: racemes terminal, with 4-8 small brownish' or dull yellow-white flowers; perianth 1/3in. diam.; lip stipitate, transversely oblong, with< 3 nerves and a papillose disk; pedicels becoming greatly elongated after fertilization. E. India. - The genus Didymoplexis comprises 2 or 3 species (Leucor-chis is a more recent name), in India, Malaya and the Pacific Isls., characterized by simple flexuous scapes, dorsal sepals and petals connate into a 3-parted upper lip, the lateral connate into an entire or 2-parted lower lip, the regular lip inserted on the foot of the column, very short and broad, entire: caps, becoming very long-pedicelled. Apparently of little horticultural interest.

Dielytra

: Dicentra.

Dierama

(a funnel, alluding to shape of flowers). Iridaceae. S. African cormous plants, related to Spar-axis and Ixia. Flowers large, white to purple and red, in panicled spikes: leaves long, linear, rigid: perianth short-tubed, expanded at throat, with oblong nearly equal segments; stamens 3, inserted on the perianth throat; ovary 3-celled, oblong, with many ovules, the style exserted: fruit a 3-valved caps. There are 2 or 3 species, of which D. pulcherrima, Baker, was introduced into S. Calif, many years ago: scape 2-6 ft., with remote branches: leaves narrow-sword-shaped and with a very slender point: flowers 1 1/2 in. long, pendulous, blood-red-purple, bell-shaped. B.M. 5555 (as Sparaxis pulcherrima). Requires the treatment given Ixia.

Dietes

: Moraea.

Dhivaria

: Acanthus. '

Dill

(Anethum graveolens, Linn.), an annual or biennial plant of the Umbelliferae, the seeds of which are used as a seasoning, as are seeds of caraway and coriander. It is of the easiest cult, from seeds. It should have a warm position. The plant grows 2-3 ft. high: the leaves are cut into thread-like divisions: the stem is very smooth: the flowers are small and yellowish, the little petals falling early. It is a hardy plant. The foliage is sometimes used in flavoring, and medicinal preparations are made from the plant. The seeds are very flat and bitter-flavored. Native of S. E. Eu.

Dimorphanthus

: Aralia.

Dion

: Dioon.

Diostea

(probably two stones or seeds). Ver-bendcese. Once referred to Baillonia, but now kept distinct; closely allied to Lippia, but differing widely in habit, in the slender green branches, in the branchlets having very long internodes and being cylindric and hollow. D. juincea, Miers, of the Andes of Chile and Argentina, is a bush or small tree, with the long branches constricted when dry: leaves opposite, 1 in. or less long, sessile, oblong or ovate-oblong, obtuse, crenate, rather fleshy: flowers small, pale lilac, in peduncled axillary or terminal spikes; corolla tubular, inflated above the middle, hairy inside, with 5 very short rounded spreading lobes; stamens 4, didynamous. B.M. 7695.