978 



DELPHINIUM 



DENDROBIUM 



rather long, straight or somewhat curved: follicles 3, 

 either glabrous or pubescent; seeds 3-cornered, 3- 

 winged, not scaly. June, July. Siberia. B.R. 473. 

 J.F.I, pi. 49. Gt. 13:253. P.M. 16:258 (as D. mag- 

 nificum). 



DDD. Seeds scaly. 



25. formdsum, Boiss. & Huet. Fig. 1234. St. strong, 

 2-3 ft., hairy below, rather glabrous above: lower Ivs. 

 5-7-parted, long-petioled ; upper ones 3-5-parted, short- 

 petioled or sessile, all alternate: racemes many-fld.; 

 fls. blue, with indigo margins ; spur long, violet, bifid at 

 the tip: follicles 3, pubescent; seeds scaly. June, July. 

 Asia Minor perhaps, but the origin of it is disputed. F.S. 

 12:1185. R.H. 1859, p. 528. 



G.Z. 1: 144. H.F. 8:99. The 

 most permanent form for nat- 

 uralizing, because it is so 

 hardy. If given rich soil and 

 good cult., it is one of the 

 most effective for use in 'the 

 permanent fl. - border. Var. 

 ccelestinum, Hort. Fls. light 

 blue. 



26. Maackianum, Regel. 

 Erect, 3 ft. high, pubescent or 

 glabrous, branched above: Ivs. 

 pubescent on both sides, base 

 often truncate or reniform, 

 3-5^parted, the parts serrate; 

 petioles dilated at the 



base : peduncles yellow- 

 hairy, with the bracts 

 often inserted above 

 the base; fls. in loose 

 panicles; sepals blue, 

 half as long as the 

 spurs; petals dark 

 violet: follicles often 

 glabrous, %in. long; 

 seeds small, distinctly 

 scaly. July. Siberia. 



27. hybridum,Steph. 

 St. 3-4 ft., pubescent 

 above: root somewhat 

 bulbous: Ivs. 5-many- 

 parted; lobes linear; 

 petioles dilated and 

 sheathing at the base: 

 racemes dense ; fls. blue, 

 lower limbs white- 

 bearded; spur straight, 

 longer than the sepals r 

 follicles 3, hairy; seeds 

 ovate, with transverse 

 scales. June-Aug. 

 Mts. of Asia. R.H. 

 1893, p. 258; same 

 cut in S.H. 2:282. 

 There are many double 



and semi-double varieties of this type. This is the 

 tallest and most robust of the popular species of Del- 

 phinium. It will respond well to fertilizer and cult. 

 When the clumps become large and strong they are 

 usually set about 4 ft. apart. Young plants may be 

 set 2 ft. apart and thinned a year or two later. 



Var. Barlowii, Paxt. Very large, semi-double fls., 

 deep blue, with brownish center. A supposed hybrid 

 with D. grandiflorum. B.R. 1944. Intro. 1892. 



AAA. Perennial, garden hybrids. 



28. cult&rum, Voss (D. hybridum, Hort., not Steph.). 

 The general mixed and more or less undefinable hybrid 

 delphiniums, constituting some of the choicest garden 

 and border plants of many colors, single, semi-double 

 and double. 



1234. Delphinium formosum. 



D. cierulescens, Freyn. A fine Asiatic species, with single and 

 double forms. P.M. 16:258. D. cdndidum, Hemsl. A dwarf 

 perennial: fls. pure white. Uganda. B.M. 8170. D. cardiopeta- 

 lum, DC., is a pretty annual, branching very low, the outer branches 

 very short, giving a pyramidal form when covered with blue fls. 

 R.H. 1893, p. 228. D. caucdsicum, C. A. Mey. (D. speciosum var. 

 caucasicum, Huth.). Similar to D. cashmerianum. D. Davidii, 

 Franch. Hairy: Ivs. 3-parted almost to the base: fls. light blue. 

 China. D. divaricatum, Ledeb. Allied to D. Consolida, but taller, 

 more branched, with smaller more abundant fls. Caucasus and 

 Caspian region. R.H. 1912, p. 513. D. macrocentron, Oliv. Per- 

 ennial, hairy in nearly all parts: fls. blue and green or yellow and 

 green. E. Trop. Afr. B. M. 8151. D. Moerheimei, Hort. A garden 

 hybrid. D. Pdrdonii, Craib. Fls. blue in somewhat lax raceme. 

 China. D. Pdrryi, Gray, is also listed in the trade, and is 

 closely allied to D. Consolida. D. Wheelerii is listed in the trade 

 and is doubtless a variety of D. speciosum, Bieb., from E. Asia. 

 Many other species may be expected in the lists of collectors and 



K. C. DAVIS. 



DEMAZERIA: Desmazeria. 

 DEMERARA ALMOND: Terminalia. 

 DENDRIUM : Leiophyllum. 



DENDROBIUM (tree and life; they are epiphytic). 

 Orchiddcese. Epiphytic orchids of great horticultural 

 merit, grown in hothouses and greenhouses. 



Pseudobulbs (sts.), tufted or arising at intervals 

 from a creeping st. sometimes very short and thick, 

 more commonly elongated and often thickened at or 

 near the base, naked or leafy at time of flowering: fls. 

 usually showy, rarely small, in terminal or lateral 

 racemes which are long and lax or short and dense, 

 sometimes of a few fls., or sometimes reduced to 1 or 

 2; sepals about equal, the dorsal free, the lateral adnate 

 obliquely to the foot of the column, forming either a 

 short sac-like or long spur-like foot or mentum; petals 

 usually resembling the dorsal sepal, either broader or 

 narrower; lip jointed or adnate to foot of column, 

 3-lobed or entire; pollinia 4. A large genus of about 

 600 species, ranging from India and Ceylon to Austral., 

 New Zeal., Japan, and the Pacific Isls., being especially 

 numerous in the Malay Archipelago. There are nu- 

 merous hybrids, artifically produced. 



There are two well-marked sections in this genus for 

 the guide of the cultivator, the evergreen and the decid- 

 uous. The first named should not be allowed to become 

 dry at the roots at any period, or loss of vigor will 

 result. Among these, also, are some that need warm- 

 house treatment all the time, such as D. Phalsenop- 

 sis, D. bigibbum, D. Bensonise, D. Brymerianum, D. 

 Dearei, and others. There are, in fact, but few among 

 the evergreen species that need a coolhouse, and of 

 these D. formosum, D. infundibulum and its variety 

 Jamesianum are conspicuous. Apart from these, the 

 evergreen dendrobes should be kept in a warmhouse 

 during winter where 60 F. may be maintained. 

 All the deciduous species (typified by D. Nobile, D. 

 Wardianum and D. Pierardii) need a marked resting 

 period, easily determined by the finishing up of the 

 growth in autumn, and the swelling of the nodes for 

 flowering in spring. When at rest, it does not hurt the 

 plants to be subjected to a low temperature of 45, 

 and it may be done to retard plants for later blooming, 

 allowing the day heat to be regulated by the sun, 

 with plenty of ventilation on favorable days. After the 

 pseudobulbs have flowered, they cease to be of value 

 to the plants, and should be cut out; if there are por- 

 tions that have not produced flower-buds, these may 

 be used for propagation, cutting the pieces into lengths 

 of several joints or nodes, and laying them on moss 

 in a warm propagating-house or -case, when they 

 will soon produce growths. The above also applies 

 to the hybrids, now so numerous, that have been 

 raised from the deciduous Indian species. Another 

 section that requires warmth in winter, and now very 

 much grown for cut bloom, is represented by D. 

 Phalsenopsis and D. bigibbum. These are Australian, 

 quite distinct in growth, and usually short-lived in 

 cultivation. The flowers are produced freely for a 



