490 



DIPLADENIA 



DIPLADENIA 



used sparingly until it is desired to start the plants into 

 fresh growth. For points concerning training and 

 pruning, consult Gn. 5:18. G EO . McWiLLiAM. 



Few tropical plants excel the Dipladenias as green- 

 house twining plants, their handsome sprays of flowers 

 being produced in profusion from May to November, 

 when well grown. The usual method of propagation is 

 by 1- or 2-jointed cuttings of the well ripened growths 

 inserted in sand with brisk bottom heat, when they will 

 usually root very readily. Seeds are not often produced 

 in this genus, though occasionally well grown plants 

 will produce seeds, which should be sown as soon as ripe, 

 in pans of light, peaty soil, with a goodly proportion of 

 silver sand mixed with it, and the pans placed in a 

 warm, moist atmosphere. If given good attention the 

 seedlings will flower the first year. Dipladenias thrive 

 best when potted in fern or kalmia root fiber only. The 

 potting should be attended to in early spring, just before 

 active growth commences. Care must be taken not to 

 injure their tuberous roots, as this will result in weak- 

 ening very materially the vitality of the plants. Great 

 care must also be exercised in watering until the plants 

 are in active growth, when they will require an abun- 

 dance of water at the roots; they are also greatly bene- 

 fited by an occasional watering of clear liquid cow- or 

 sheep-manure water. Frequent spraying of the foliage 

 will also be necessary to keep down the attacks of in- 

 sects. Dipladenias do best when grown in full sunlight, 

 the roof of an unshaded greenhouse being well suited 

 to them. The pots should be covered with some non- 

 conducting material, however, such as sphagnum moss, 

 to prevent injury to the roots by the heat of the sun. 

 As soon as the season of blossoming is past, the plants 

 should be cut back, and allowed to rest by gradually 

 withholding the water, keeping them during the winter 

 almost dry in a temp, of 55. EDWARD J. CANNING. 



The following kinds sold in America are presumably 

 horticultural varieties which have been insufficiently 

 described : 



D. amabilis. Lvs. short-stalked, oblong, acute: fls. rosy crim- 

 son, 4-5 in. across ; corolla lobes very round and stiff. See Gn. 

 51, p. 227. Said to be a hybrid of D. crassinoda and D. splen- 

 dens. D. Brearleyana. Lvs. oblong, acute, dark green: fls. 

 pink at first, changing to rich crimson, very large. Gn. 51, p. 

 226. D. eximia. A recent hybrid. Z). hfibrida. Lvs. large, 

 stout, bright green : fls. flaming crimson red. D. insignis. 

 Stout growing; foliage strong; fls. rosy purple. 



A. Fls. dark purple. 



atropurpurea, DC. Glabrous, Ivs. ovate, acute: ra- 

 cemes axillary, 2-fld. : peduncles a little longer than the 

 Ivs.; pedicels twisted, bracted; calyx lobes lanceolate- 

 acuminate, a little shorter than the pedicel, and a third 

 as long as the cylindrical part of the corolla; corolla 

 tube funnel-shaped above the middle ; lobes triangular, 

 wavy, spreading, shorter than the dilated part of the 

 tube. Brazil. B.R. 29:27. Gn. 44:937. I.H. 42:33. Gt. 

 43, p. 548. Lvs. about 2 in. long, acute at the very base: 

 petiole % in. long; corolla dark purple inside and out; 

 tube 2 in. long. None of the pictures cited above show 

 the fleshy, spreading, scale-like stipules nearly as long 

 as the petioles which De Candolle says are characteristic 

 of the subgenus Micradenia. F.S. 1:33 is said to be D. 

 atroviolacea of the subgenus Eudipladenia, in which the 

 stipules are absent or else small and erect. The plate 

 shows a strongly ribbed corolla-tube and Ivs. cordate at 

 the base. 



AA. Fls. white: throat yellow inside. 



Bolivi6nsis, Hook. Glabrous: stems slender: Ivs. pe- 

 tioled, 2-3 K in. long, oblong, acuminate, acute at base, 

 bright green and glossy above, pale beneath; stipules 

 none: racemes axillary, 3-4-fld. : peduncles much shorter 

 than the Ivs., about as long as petioles and pedicels: 

 bracts minute at the base of the twisted pedicels : calyx 

 lobes ovate, acuminate, 3 lines long: corolla almost sal- 

 ver-shaped, tube and throat slender and cylindrical, the 

 former % in. long, the latter twice as long and half as 

 broad again: limb 1% in. across; lobes broadly ovate, 

 more acuminate than in D. atropurpurea. Bolivia. 

 B.M, 5783. Gn. 44:922. Gng. 7:342. 



AAA. Fls. rose: throat deep rose or purple within, 

 whitish outside. 



splendens, DC. Fig. 718. Stem glabrous: Ivs. sub- 

 sessile, elliptic-acuminate, cordate at the base, wavy, 

 pubescent, especially beneath, veins elevated, numer- 

 ous: racemes axillary, longer than the Ivs., 4-6-fld.: 

 calyx lobes red-tipped, awl-shaped, as long as the cylin- 

 drical part of the corolla tube, which is half the length 

 of the funnel-shaped portion : lobes of the limb rotund, 

 subacute, almost as long as the tube. Brazil. Lvs. 4-8 

 in. long, 1 %-3 in. wide, pedicels K-l in. long: corolla 

 tube 1 K in. long, white outside, lobes rosy, throat 

 deeper, almost purple. Brazil. B.M. 3976. F.S. 1:34 

 shows a yellow throated form. Var. profusa, Rod. (D. 

 profusa, Hort.), has larger and brighter rosy fls., lined 

 with yellow inside, the outside of the tube rosy except 



718. Dipladenia splendens (X%). 



at the base, which is yellow. I.H. 30:491. Int. by B, S. 

 Williams. D. amabilis, Hort., is said to be a hybrid of 

 D, crassinoda andZ>. splendens. I.H. 27:396, shows a 

 12-fld. raceme with exceptionally bright red fls. 



AAAA. Fls. salmon-colored: throat yellow inside and 



out. 



urophylla, Hook. Named for the long, narrow apex of 

 the leaf. Glabrous, erect bush, not a vine : branches 

 numerous, swollen at the joints: Ivs. ovate-oblong, ob- 

 tuse at the base, suddenly narrowed at the apex into a 

 narrow point % in. long; peduncles long, drooping, flex- 

 uose: racemes axillary, 4-6-fld.: calyx segments awl- 

 shaped: corolla dull yellow outside, deeper and brighter 

 yellow within; tube cylindrical in lower third, then 

 swelling into an almost bell-shaped throat; lobes of the 

 limb salmon inclined to purple, acute. Brazil. B.M. 

 4414. P.M. 16:66. F.S. 5:425. 



D. crassinbda, DC. Glabrous: stem much branched, with 

 many nodes: 1 vs. lanceolate, acute or almost acuminate, acute 

 at the base, shining and leathery on both sides : racemes axil- 

 lary, about 6-fld.: calyx lobes lanceolate, acuminate, a little 

 shorter than the cylindrical part of the corolla tube, 2 or 3 

 times shorter than the pedicel; corolla tube bell-shaped above 

 the middle ; lobes obovate-orbicular. The above is the original 

 description by De Candolle, who adds that the Ivs. are 3-3% in. 

 long, %-lin. wide, petiole 2-3 lines long: stipules interpetiolar, 

 with 4 short cuspidate teeth. The plant pictured in B.R. 30:64 

 was renamed D. Lindleyi by Lemaire chiefly for its pilose stem 

 and stellate-lobed stipules. Later authorities refer B.R. 30:64 



