This section is from the book "The Standard Cyclopedia Of Horticulture Vol2", by L. H. Bailey. See also: Western Garden Book: More than 8,000 Plants - The Right Plants for Your Climate - Tips from Western Garden Experts.
(Greek words, signifying an acanthad of curious structure). Acanihaceae. Tropical shrubs or sub-shrubs, with blue or rose-colored flowers, sometimes grown under glass and in the open in warm countries.
Leaves entire or scarcely dentate: flowers in bracted spikes which are sometimes paniculate, the bracts usually much exceeding the calyx; calyx deeply 5-lobed or -parted; corolla-tube elongated and slender, more or less curved, bearing an oblique spreading 5-lobed limb; perfect stamens 2, affixed in the throat, included; style slender and recurved: fruit an ovate or oblong caps., the seeds 4 or fewer. - Some 15 to 20 species in E. India and Malay Archipelago; by some authors the name Eranthemum is applied to these plants (950) and what are known as Eranthemum in this work then become Pseuderanthemum.
This genus contains some tender shrubs of rather difficult culture under glass, but great favorites in the tropics, particularly in India. D. nervosus is a popular winter- and spring-blooming shrub in southern Florida. It has blue flowers an inch across, five-lobed, and shaded purple at the mouth of the tube. For culture, see Justicia.
T. Anders. (Eranthemum nervosum, R. Br. E. pulchellum, Andr., and some dealers, while that of others is E. bicolor, and that of Roxburgh is D. purpurascens). Fig. 1204. Glabrous or very nearly so: leaves ovate or elliptical, acuminate at both ends, somewhat crenate or entire: spikes axillary, opposite, overlapping and interrupted: bracts elliptical, acute, ner-vose: limb of the corolla as wide as the tube is long. India. B.M. 1358 (as Justicia nervosa). Gn. 51:352. G.C. II. 21:415. - A very pretty shrub for the warm-house, 2-6 ft., its flowers being of a color that is not very common in winter-blooming plants. It is an easy subject to manage, requiring a light, rich soil, full sunlight and plenty of water. Cuttings of young growth root readily in a warmhouse.
Fig. 1204. Daedalacanthus nervosus. (X 1/3) aa. Young leaves brownish or straw-colored.
T. Anders. stem pubescent toward top: leaves elliptic-lanceolate, ovate-acuminate, attenuate at base: spikes linear, somewhat interrupted: bracts elliptic, rather obtuse, nervose: flowers pale violet-blue. India. B.M. 6686. - Differs from D. nervosus in laxer infloresence, hairy leaves which are scabrid-pubescent on the nerves beneath, and more pubescent shoots.
Wattii, Bedd. (D. parvus, C. B. Clarke). Slender, 2 ft.: leaves deep green with a light metallic shade, very broad-ovate: flowers 1 in. across, blue or violet-blue, the corolla-lobes broad-obovate and narrowed abruptly to a point, the white stigma protruding from the narrow throat. India. G.M. 44:645. G.C. III. 32:311. A.F. 17:382. - A good dwarf species with flowers in dense clusters, blooming in pots when 1 ft. high and flowering in Sept. Requires a warmhouse treatment; grows well in sandy loam; propogation by cuttings. l, H. B.†