1636 



IBIDIUM 



BB. Perennials: sis. woody at the base. 

 c. While in flower, racemose. 



5. sempervirens, Linn. Perennial, to 1 ft., branch- 

 ing, somewhat shrubby: Ivs. oblong, obtuse, nar- 

 rowed at base, glabrous: fls. white, in elongating 

 racemes. S. Eu. Gng. 2 : 145 (fine habit sketch) . F.R. 

 1:75 (poor). G.W. 8, p. 373. Var. plena, a double 

 form, is cult., but is less desirable. Var. rosea and var. 

 foliis variegatis, are sold abroad. Var. superba, or 

 Perfection, is said to be one of the best forms. This is 

 the commonest, hardiest and most permanent of the 

 perennial kinds. When the rarer and tenderer kinds are 

 winter-killed, /. sempervirens is likely to spread out and 

 surround the labels of other kinds. This probably 

 explains why some of the most reliable dealers have 

 sold this plant under other names, particularly /. 

 gibraltarica. 



cc. While in flower, corymbose. 

 D. Margin of Ivs. entire. 



6. saxatilis, Linn. Perennial, dwarf, evergreen, 6 in. 

 or less, with ascending sts. : Ivs. linear, entire and some- 

 what fleshy, mostly ciliate: fls. white, corymbose. S. 

 Eu. Var. corifdlia, Suns (I. corifolia, Sweet). Lvs. gla- 



1945. Iberis Tenoreana var. petraea. 



brous: fls. white. B.M. 1642, although this picture was 

 doubtfully referred by Baker to /. Garrexiana. G.M. 

 46:289. 



7. Garrexiana, All., not Scop. Lvs. oblong, narrow 

 at the base, glabrous: fls. rather small, white, the 

 racemes much elongating. Piedmont, Pyrenees. 

 Referred by some to 7. sempervirens. Intermediate 

 between /. sempervirens and /. saxatilis, having the 

 habit of the latter. It is sometimes described as /. 

 sempervirens var. Garrexiana. Gn. 62, p. 393. G.M. 

 48:211. 



DD. Margin of Ivs. toothed toward apex. 



8. gibraltarica, Linn. Fig. 1944. Perennial, ever- 

 green, diffuse, 12-20 in.: Ivs. wedge-shaped, obtuse, 

 subciliate: outer fls. pink, inner ones white. Spain, 

 Morocco. B.M. 124. G.C. III. 46:158. Gn. 10:288; 

 76, p. 69. G. 27:446. R.H. 1870:330. Gn. 24, p. 549, 

 same as R. H. 1885, p. 446. This is considered by 

 some as the most striking and showy of the perennial 

 kinds. It grows higher and more erect, with larger clus- 

 ters and larger fls., but is less hardy than the others. 

 This is much sought after, and the stock in the nur- 

 series is often not true to name. Var. hybrida, is adver- 

 tised, the fls. white shading to lilac. 



AA. Infl. corymbose in fr. 

 B. Annuals: sts. not woody at the base. 



9. umbellata, Linn. COMMON ANNUAL CANDYTUFT. 

 Upright, 6-15 in. : Ivs. lanceolate, acuminate, lower ones 

 serrate, upper ones entire: fls. in the wild typically pur- 

 plish, rarely white, in umbels terminating all the main 

 sts.: pods acutely 2-lobed. Italy, Crete, Spain. B.M. 

 106. This is the common hardy annual candytuft 

 with colored fls., the colors being more numerous and 

 better fixed than in any other species. Trade names are 



vars. carminea, carnea, lilacina and Dunnettii (/. Dun- 

 nettii, Hort.), the last being dark purple. Vars. rdsea, 

 purpurea and alba are advertised abroad, also vars. 

 nana, pumila and hybrida. Tall and dwarf forms of all 

 the colors are procurable. 



BB. Perennials: sts. woody at the base. 

 c. Lvs. ciliate, crenate. 



10. Tenoreana, DC. Perennial, somewhat shrubby 

 at base, ascending, about 6 in. high : lower Ivs. obovate, 

 narrowed at base; upper Ivs. oblong-linear: fls. pur- 

 plish or whitish, the clusters flattish and not elongating: 

 pods notched at apex. Naples. B.M. 2783. L.B.C. 

 18: 1721. G. 34: 119. According to Baker (G.C. 1868: 

 711), this is the only perennial kind that is decidedly 

 hairy. DeCandolle says the Ivs. are puberulous. Var. 

 petrsea, Nichols. (7. petrsea, Jord.). Fig. 1945. A good 

 rock-garden form, with fls. white tinged red in center. 



cc. Lvs. not ciliate, entire or subdentate. 



11. Pruitii, Tineo. Perennial, 6 in., woody at base: 

 Ivs. glabrous, obovate-spatulate, entire or subdentate: 

 fls. white, in compact clusters: pods merely notched at 

 apex; seed not margined, the radicle descending; sep- 

 tum of pod simple. Sicily. 



12. semperfldrens, Linn. Perennial, evergreen, 1-2 

 ft.: Ivs. wedge-shaped or spatulate, obtuse, entire, gla- 

 brous, somewhat fleshy: fls. large, pure white, fragrant: 

 pods scarcely notched at apex; seed somewhat margined, 

 the radicle horizontal; septum of pod nearly double. 

 Sicily and perhaps Persia. Var. plena, a double variety. 

 Var. f61iis variegatis said to be cult, abroad. 



7. cordifdlia is an error for I. corifolia. 7. correse/dlia, Hort., ia 

 a common trade name abroad, which is usually spelled, I. corrse- 

 folia in American catalogues. There is no genus Corra, and Correa 

 is an Australian plant of the Rutacese. Specimens should therefore 

 be compared with I. saxatilis var. corifolia. Mottet's description, 

 however, would place this plant directly after I. Garrexiana in the 

 key, being distinguished from I. Garrexiana by the fls. becoming 

 purplish instead of always remaining white. Mottet says that I. 

 corresefolia, Hort., is a hybrid, with spatulate, entire, obtuse Ivs. 

 I hyacinthifldra, Hort., is an annual candytuft with milk-white fls. 

 in elongated panicles. It is said to be a first-quality cut-fl. for 

 summer bloom. 7. jucunda, Schott & Kotschy=jEthionema 

 coridifolium. 7. Lagascdna, DC. Annual, 1 ft.: Ivs. oblong- 

 spatulate, toothed at apex: fls. pure white, in close corymbs: pods 

 2-lobed. Spain. 7. lildcina of trade catalogues is presumably a 

 lilac-fld. variety of I. umbellata. 7. nana hybrida, Hort., is not I. 

 nana, All., a distinct botanical species, but a trade name of mixed 

 dwarf varieties of some common annual kind, presumably I. 



WILHELM MILLER. 

 L. H. B.f 



IBIDIUM (named from the fancied resemblance of 

 the anther to the beak of an ibis). Orchiddcese. By 

 some authors used to supplant the generic name 

 Spiranthes (which see), but the latter name is retained 

 by the "nomina conservanda" of the Vienna code. 

 Under Ibidium, the nomenclature becomes: 



I.coloratum, House (Spiranthes colorata, N.E. Br.); 



/. cernuum, House (Spiranthes cernua, Rich.) ; 



/. Romanzoffianum, House (Spiranthes Roman- 

 zoffiana, Cham.); 



/. plantagineum, House (Neottia plantaginea, Raf. 

 Neottia lucida, H. H. Eaton. Spiranthes latifolia, 

 Torr. S. lucida, Ames); 



/. prsecox, House (Spiranthes praecox, Wats.); 



7. Beckii, House (Spiranthes Beckii, Lindl. S. 

 simplex, Gray. S. Grayi, Ames); 



7. gracile, House (Neottia gracilis, Bigel. Spiranthes 

 gracilis, Beck); 



7. vernale, House (Spiranthes vernalis, Engelm. & 

 Gray). Lvs. oblong-lanceolate to linear-lanceolate, 

 tapering to both ends, J^in. wide or less, mostly basal, 

 the lower ones usually withering before flowering time : 

 scape densely pubescent above; floral-bracts longer 

 than the ovaries, with hyaline margins ; raceme slender, 

 1-ranked, 1-3 in. long; fls. J^in. long, yellowish, lip 

 ovate to ovate-oblong, pubescent beneath. Mass, to 

 Fla., 111. and Kans. jj. D. HOUSE. 



