2966 



RICINUS 



ROBINIA 



medium size, more than twice as broad as thick; coty- 

 ledons ovate, rounded at the base, glands small, flat: foli- 

 age red to almost black. Contains var. Gibsonii, dwarf, 

 dark red with metallic luster; Gibsonii cocdnea; Gibsonii 

 mirdbilis, bright carmine fr.; cambogensis, very dark 

 foliage; hybridus panormltans, large, dark and glaucous, 

 a cross with zanzibarensis and philippinensis. 



AAA. Markings of seed-coat of fine bright red mottling, 

 diffusing into the ground-color (gray or brown in some of 

 the hybrids); seeds large, flat; cotyledons cordate; glands 

 many, large, projecting at the apex and decurrent: plants 

 large, generally without much red color, if any. Contains 

 var. zanzibarensis (A.G. 16, p. 383. G.C. III. 14 : 783. Gn. 

 44, p. 563. Gt. 43, p. 69. I.H. 41 : 100) and its varie- 

 ties, which seem to be crosses with some of the previous 

 groups. (Gt. 44, p. 77.) 



Other names in the trade, but not classified above, 

 are: cxriileus, Bismarckidna, and insignis. 



J. B. S. NORTON. 



RIGID ELLA (Latin, somewhat rigid; referring to the 

 pedicels, which after the petals fall become erect and 

 stiff). Iridacese. Half-hardy bulbous plants allied to 

 Tigridia and useful for planting in the garden. 



Leaves broad, plicate, with channeled petiole: fls. 

 fugitive, bright red, pedicelled; perianth-tube none; 

 segms. very unequal, outer oblong, connivent in a cup 

 in the lower third, then spreading or reflexed; inner very 

 small, erect, ovate, with a narrow claw. About 3 

 species, Mex. Distinguished from Tigridia by the very 

 small inconspicuous ovate and erect inner perianth- 

 segms., those of Tigridia being larger, fiddle-shaped and 

 spreading. 



flammea, Lindl. St. 3-5 ft. high : Ivs. broadly equitant, 

 plicate and sheathing the st. below: fls. in terminal 

 fascicles, between the 2-valved spathe; peduncles 

 recurved but becoming erect in fr.; perianth 3-foliate, 

 the limb concave and revolute, bright scarlet striped 

 black at the throat, spirally twisted after anthesis: 

 caps, papery, 3-valved at the apex. Mex. B.R. 26:16. 

 H.U. 2, p. 44. 



immaculata, Herb. St. 2-3 ft. high, forked: lower 

 Ivs. narrowly lanceolate, acute, about as tall as the 

 scape: fls. bright crimson, not marked with black; 

 perianth-segms. acute, undulate, recurved. Mex. B.R. 

 27:68. F.S. 5:502; 21:2215 (fls. brick-red). 



F. TRACY HuBBARD.f 



RINDERA (named after Dr. A. Kinder, the dis- 

 coverer of the first plants of this genus). Boraginaceae. 

 Perennial herbs, erect, canescent-pubescent, scabrous 

 or glabrous, base often cespitose: sts. simple or spa- 

 ringly branched: Ivs. alternate, narrow: cymes terminal, 

 corymbose or paniculate-racemose, without bracts; fls. 

 pedicelled; calyx 5-parted, lobes narrow; corolla tubular- 

 funnel-shaped; lobes 5, imbricate, broad or oblong, 

 erect or somewhat spreading; stamens 5; ovary 4 dis- 

 tinct lobes: nutlets 4. About 10-15 species, S. Eu., W. 

 and Cent. Asia. R. umbelldta, Bunge. St. erect, 1-2 

 ft. high: basal Ivs. tufted, evergreen, oblong to ovate- 

 lanceolate, long-petioled; cauline Ivs. lanceolate with a 

 winged petiole or sessile, entire, gray-pubescent: fls. 

 reddish yellow or dark brown; calyx densely woolly; 

 corolla-lobes erect, oblong: nutlets ovate-orbicular, 

 broadly winged. Hungary and Servia. G.C. III. 42: 

 226. 



RITAIA (named after Mr. Rita of the Khasia Com- 

 mission). Orchidacese. Epiphytic orchid, rare in cult.: 

 st. much and subdichotomously branched, densely 

 clothed with scarious sheaths : branches short and bear- 

 ing a terminal sheathed, 1-2-fld. peduncle: If. fleshy, 

 lanceolate, jointed to the axis at the end of a branch: 

 fls. small, puberulous; lateral sepals broad-based, adnate 

 to the foot of the column; lip adnate by its margins to 

 the column. One species, Himalaya. Now referred to 



3412. Rivina humilis. 



Ceratostylis. C. himaldica, Hook. f. (Ritdia himaldica, 

 King & Pantl). Sts. pendulous with a solitary If. and 

 a single terminal peduncle: If. fleshy, linear-oblong, 

 apex obliquely notched: fls. 1, occasionally 2, pale 

 yellow, pubescent outside; dorsal sepal ovate-lanceo- 

 late, lateral sepals broader, abruptly acuminate; petals 

 linear, about as long as the sepals; Up fleshy, not lobed. 



F. TRACY HUBBARD. 



RIVINA (named after A. Q. Rivinus, professor of 

 botany, at Leipzig, 1691-1725). Phytolaccdceae. Erect 



herbs, shrubby 

 at base, suitable 

 for the warm- 

 house and also 

 useful outdoors 

 as a summer 

 annual. 



Leaves alter- 

 nate, slender- 

 petioled, ovate, 

 ovate-lanceo- 

 late or cordate- 

 ovate; stipules 

 minute and 

 caducous: infl. 

 racemose, axil- 

 lary or rarely 

 terminal; fls. 

 small, perfect ; 

 perianth 4- 



parted; stamens 4: berry red, pea-like. Species 3 (Wal- 

 ter, Engler's Pflanzenreich, hft. 39), native of Trop. 

 and Subtrop. Amer., but intro. into Asia and Afr. 



humilis, Linn. (R. laevis, Linn.). ROUGE PLANT. 

 Fig. 3412. St. with spreading branches, Yy-2 ft. high: 

 Ivs. 1-3 in. long: racemes slender, pendulous, many- 

 fld., as long as the Ivs.; fls. white, 1-1 Yi lines long; 

 calyx pale rose: fr. \-\Yi lines long. S. Fla. B.M. 1781. 

 V. 5:75. S.H. 2:111. Gn. 22, p. 68. Variable. 



F. TRACY HUBBARD. 



ROBINIA (after Jean and Vespasien Robin, herb- 

 alists to the king of France in the sixteenth and 

 seventeenth centuries). Leguminosse. LOCUST. Orna- 

 mental woody plants grown chiefly for their handsome 

 white, pink, or purple flowers and the graceful foliage. 

 Deciduous trees or shrubs : branches without terminal 

 bud, often with stipular spines: Ivs. alternate, stipulate, 

 odd-pinnate, with stalked entire stipellate Ifts.: fls. 

 slender-pedicelled, in axillary racemes; calyx campanu- 

 late, 5-toothed, slightly 2-lipped; corolla papilionaceous, 

 with short-unguiculate petals, standard large, rounded, 

 turned back, scarcely longer than wings and keel; 9 

 stamens connate, 1 free or partly free: pod oblong 

 to linear, flat, several-seeded, dehiscent. About 15 

 species in N. and Cent. Amer. 



The locusts are all handsome shrubs and trees with 

 bright green and graceful pinnate foliage and showy 

 white, pink, or purple papilionaceous flowers in usually 

 pendulous or nodding racemes followed by pods attrac- 

 tive in some species by the dense covering of purple 

 hairs. R. Pseudacacia and R. viscosa are hardy as far 

 north as Ontario, and most other cultivated species as 

 far north as Massachusetts. They are not particular as 

 to the soil and they do well even in poor sandy soil 

 and dry locations. They stand transplanting well and 

 grow rapidly while young. Some species, particularly 

 R. hispida, spread by suckers and may for this reason 

 become a nuisance in lawns and mixed groups. R. 

 Pseudacacia, on account of its heat- and drought- 

 resisting qualities, together with its ornamental merits, 

 has become a favorite street tree for cities, particularly 

 in Europe; in this country it is now not so much planted, 

 as it is liable to the attacks of the borer and therefore 

 short-lived; it stands severe pruning well. Propagation 

 is by seeds sown in spring and germinating readily; they 



