Diplolaena

(double cloak, in allusion to the double involucre). Rutaceae. W. Australian tomentose shrubs, sometimes cultivated, but apparently not in American trade. Leaves simple and entire, stalked, alternate: flowers red from the appearance of the many stamens in the terminal heads which are flower-like and short-peduncled or sessile and surrounded by an involucre of broad bracts in 3 or 4 series of which the inner ones are large and petal-like; calyx wanting; petals 5, small and narrow; disk small; stamens 10, much exserted, the filaments bearded; ovary 5-lobed, the styles united into 1: fruit 2-valved cocci, resulting from the division of the ovary. - About 4 species. D. grandiflora, Desf., 5-6 ft., with rigid spreading branches, the ovate or broad-oblong very obtuse leaves tomentose or hoary on both sides. D. Dampieri, Desf., distinguished chiefly by the leaves being green and smooth on the upper surface. B.M. 4059. B.R. 27:64. H.U. 5:42. L. H. B.

Diplopappus

: Aster.

Diplostephium

(double crown or pappus). Composite. This genus as now defined comprises upward of a dozen species in Venezuela, Colombia and to Peru, probably not in cultivation; the D. amygaalinum, Cass., of gardens is Aster umbellatus, Mill., under Gray's treatment, and Doellingeria umbellata, Nees, of some other authors. Doellingeria differs from Aster proper in its double pappus, the inner bristles long and capillary and the outer short and rigid; involucre-bracts short and lacking herbaceous tips; heads corymbose or solitary; rays rather few, white or rose-tinged: leaves veiny, not stiff. (Named for Th. Doellinger, botanical explorer.)

Aster umbellatus is a stout plant (2-7 ft.) of low grounds from Newfoundland to Ga. and Ark., variable, and lower forms occurring: very leafy, with numerous crowded heads: leaves lanceolate to oblong-lanceolate (to 6 in. long), tapering to both ends: involucre short; rays white. A good plant for the wild garden.

L H B

Disemma

: Passiflora.

Disocactus

(two-shaped Cactus). Cactacea. Bushy cactus, 2-3 ft. high, sometimes seen as a pot-plant in collections.

Stems terete, usually erect: branches flattened as in Epiphyllum: flowers regular, with very short tube; petals few, elongated, spreading; ovary nearly naked, small.

Biformis

Lindl. (Phyllocatus bifomis, Lab.). Soon pendulous, the branches cylindrical: short branches leaf - like, the lower egg-shaped, the upper more lengthened: flowers small, purple-red, less than 2 in. expansion; ovary without angles and with minute scales. Honduras. B.M.6156. V. 2:159. J.N.Rose.

Distichlis

(Greek, two-ranked). Gramineae. Salt-Grass. Marsh Spike-Grass. Rigid erect perennials, with extensively creeping wiry rootstocks: spikelets several-fid., compressed, dioecious; lemmas coriaceous, rigid, faintly many-nerved. - Species about 6, in salt marshes on the coastal regions of Amer, and in alkaline soil of the interior. One species, D. spicata, Greene, with stiff, distichous involute blades and small narrow panicles is found in alkaline soil throughout the U. S. (Dept. Agric, Div. Agrost. 20:143). It is a good grass for binding soils subject to wash. Probably not in cultivation

A. S. Hitchcock.