2968 



ROBINIA 



ROCHEA 



hispid, branchlets, petioles, and peduncles only pubes- 

 cent or more or less hispid: Ifts. 9-15, elliptic or ovate, 

 acute, narrowed or rounded at the base, appressed- 

 pubescent beneath, at least while young, j-l in. long: 

 racemes 3-6-fld.; corolla %in. long, purple with white: 

 pod oblong, hispid. May, June. N. and S. C. This 

 species usually fruits profusely, while the preceding 

 species never or very rarely fruits. 



cc. Peduncles and branchlets glandular-hairy or viscid: 



Ifts. usually more than 15. 



D. Branchlets and peduncles glandular-hairy. 



E. Rachis of If. pubescent, glandless or nearly so. 



7. neo-mexicana, Gray. Shrub or small tree, to 25 

 ft.: branches spiny; branchlets pubescent and glandu- 

 lar: petioles villous; Ifts. 15-21, elliptic-oblong, rounded 

 and mucronate, silky pubescent beneath at least while 

 young, 1-1 ^2 in- long: racemes many-fld., dense, more 

 or less upright; peduncle and pedicels glandular-hairy; 

 corolla pale rose-colored or sometimes nearly white, 



3414. Rose acacia. 

 Robinia hispida. (' 

 (XH) 



nearly 1 in. long: pod glandular-hispid, 3-4 in. long. 

 June to Aug. Colo, to New Mex., Ariz., and Utah. 

 B.M. 7726. S.S. 3:114. F.S.R. 2:56. Gt. 41:1385. 

 R.H. 1895. Valuable for its late flowering. 



8. H61dtii, Beissn. (R. neo-mexicana x R. Pseud- 

 acacia). Tree, intermediate between the parents: Ifts. 

 larger than those of R. neo-mexiana. lJ^-2 in. long, 

 darker green and firmer than those of R. Pseudacacia: 

 racemes looser than those of the first parent; corolla 

 light pink to rose-colored: pod with scattered stalked 

 glands. Originated in the nursery of F. von Holdt, 

 Alcott, Colo. Var. britzensis, Spaeth. A form with 

 nearly whitish fls., originated in Spaeth's nursery near 

 Berlin, Germany. Also R. coloradensis, Dode, probably 

 belongs here. 



EE. Rachis of If. densely covered with stalked glands. 



9. Hdrtwigii, Koehne. Shrub, to 12 ft.: branchlets, 

 petioles, If .-rachis, and peduncle puberulous and densely 

 covered with stipitate glands: Ifts. 13-23, elliptic to 

 lanceolate, mucronate, grayish pubescent beneath, 

 1-1% in. long: racemes dense; calyx pubescent and 

 glandular-hairy; corolla rosy purple, %in. long: pod 

 oblong, densely glandular-hairy, about 2 in. long. 

 June, July. N. C. to Ala. 



DD. Branchlets and peduncles viscid. 



10. viscdsa, Vent. (R. glutinosa, Sims). Tree, to 

 40 ft.: branches without or with small and slender 

 spines; the dark reddish brown branchlets and usually 

 the petioles and peduncles densely glandular-viscid: 

 Ifts. 13-25, ovate to oblong, obtuse or acute, broadly 

 cuneate at the base, pubescent beneath or sometimes 

 glabrous, \ l /y-2 in. long: racemes 6-15-fld., dense, 

 rather upright; corolla %in. long, pink; standard with 

 a yellow blotch: pod linear-oblong, glandular-hispid, 



2-3 }/2\n. long. May, June. N. and S. C. to Ala.; 

 naturalized elsewhere. S.S. 3:115. B.M. 560. 



11. dubia, Foucauld (R. ambigua, Poir. R. inter- 

 media, Soulange-Bodin. R. Pseudacacia x R. viscosa). 

 Tree, intermediate between the parents, but more 

 similar to R. Pseudacacia, from which it differs in the 

 slightly viscid, less prickly branches, in the 15-21 Ifts., 

 and in the light pink fls. Of garden origin. Var. 

 bella-r6sea, Rehd. (R. bella-rosea, Nichols. R. viscdsa 

 var. bella-rosea, Voss. R. Pseudacacia var. bella-rosea, 

 Cowell). Branchlets more viscid: fls. larger and deeper 

 rose-colored. Garden origin. 



R. Rusbyi, Wooton & Standley. Nearly glabrous prickly shrub 

 with oval or broadly oblong Ifts. pubescent beneath, many-fld. 

 racemes with the pedicels glandular-pubescent, and with smooth 

 pods, from New Mex. ; this and the 6 or 7 Mexican species are not 



in cult ALFRED REHDER. 



ROB^NSIA (derivation not known). Leguminosx. 

 T\yining shrubs, with trifoliate Ivs. and elongated 

 axillary racemes: fls. somewhat fascicled; calyx 2- 

 lipped; corolla papilionaceous, standard somewhat 

 rounded, sulcate at the base, wings oblong, obtuse, keel 

 incurved, obtuse; stamens diadelphous : pod compressed, 

 2-valved, linear-elongate. Two or 3 species, Mex. The 



genus is now usually included in Pachyrhizus. 



R. geminiflbra, Hort., is apparently botanically 



unknown. H.U. 2, p. 231. 



ROCAMBOLE (Allium Scorodoprasum, Linn.), 

 is a humble member of the onion tribe, the 

 underground bulbs of which are used abroad 

 like garlic, known in America amongst the Cana- 

 dian French and perhaps elsewhere. The plant 

 is a hardy perennial, with a stem twisted spirally 

 above and bears at the top an umbel of flowers, 

 some or all of which are changed to bulblets. The 

 presence of these bulblets distinguishes the plant 

 from garlic. The species can be propagated by the 

 bulblets, but quicker results are secured from the 

 cloves of the underground bulbs. In mild climates, the 

 bulbs should be planted in autumn or not later than 

 February; in cold climates, plant in spring. In the 

 autumn when the leaves decay, the bulbs are lifted, 

 dried in the sun, and stored. 



Rocambole is a native of Europe, the Caucasus 

 region, and Syria. It has flat or keeled leaves, short 

 spathe, bell-shaped six-parted perianth, and the three 

 inner stamens broader than the others, three-cleft, and 

 not longer than the perianth. Good seeds are rarely 

 produced. 



ROCHEA (named after de la Roche, French botanist) . 

 Syn., Kalosdnthes. Crassulacese. Succulent shrubby 

 plants suitable for the greenhouse. 



Leaves opposite, connate at the base, oblong-ovate or 

 lanceolate: fls. rather large, aggregated in corymbose- 

 capitate cymes, white, yellow, rose, or red; calyx 5- 

 parted or 5-cleft; corolla salver-shaped, the elongated 

 claws of the petals connate with the calyx-tube, limb 

 spreading: follicles many-seeded. About 4 or 5 species, 

 S. Afr. 



Rocheas are amongst the showiest of our summer- 

 flowering greenhouse plants, and are very easy to 

 propagate. If plants are desired from a single root, 

 cuttings about 4 inches long should be selected in 

 March, and potted singly in sandy peat. The small pots 

 should be placed near the glass, in a night temperature 

 of 50. Do not keep them too wet, as they are of a 

 fleshy nature, and are liable to rot. In a few weeks, the 

 plants will be rooted and the points may be cut out 

 to encourage breaks. A few days after they are cut 

 back, repot into a pot two sizes larger, using two 

 parts fibry loam, one of sand, and one of broken char- 

 coal, adding a sixth part of sheep-manure. After 

 they are rooted, keep them near the glass, in a night 

 temperature of not over 40, when this is possible. 



