1184 



OXYDENDBUM 



late, 3-6 in. long, glabrous, veiny, slender-stalked: 

 clusters home on leafy shoots of the season: fls. open- 

 ing slowly. Rich woods, Pa. and Ohio, along the Al- 

 leghenies to Fla. B.M. 905. B.B. 2:571. S.S. 5:235. 

 F. W. Barclay and W. M. 



OXYLOBIUM (Greek, «7mrppo(Zl. Leguminfisir. This 

 is one lit many genera of Australian shrubs with pea- 

 likL- (Is. which are little known in cultivation. For 

 winter bloom under glass none of them equals Cytisus 

 Canariensis. Oxylobium is a genus of 28 species, of 

 which perhaps a dozen have been cult, in Europe. Their 

 fls. are yellow, or more or less flushed with red on the 

 keel or the base of the standard. O. CalUstachys is per- 

 haps the best for conservatories. In America it is cult, 

 only in S. Calif. 



Generic charac-tcrs: Ivs. very short-stalked, opposite 

 or more or less nil,. il, cl. i,i.l\ s.^attn-i il it alternate: 

 fls. in terminal -! .- ':., i. 'n.-; p. i;.l- rh.w.d: sta- 

 mens free: (ivai ' i' -!■ ^lalkcc!. i-:;ii-,.vuled. 

 Nearest to fill. II .- ■ , ■■■ l,ii.| i^ almui a, lung as 



The fi.M-i" 111 I • I, -nil-red the type of another 



genii^ : i: !. I III all other species of Oxy- 



III iiivcence of the pod. See 



lobiiiiii • ■' . .1,. . i.,i. . • ... I 

 Flora Aii-iiaiii ii-i- _• II I I -I. I, 



Callistachys, Buuth. Tall shrub: Ivs. mostly in ir- 

 regular whorls of 3, varying from ovate-oblong and 

 1 J^-2 in. long to lanceolate and 4-5 in. long, leathery, 

 silky-pubescent beneath when young: racemes oblong 

 or pyramidal, 2-6 in. long. B.R. 3:216 (as Callistachys 

 lanceolala). B.M. 1925 (as C. ot-a/a). P.M. 8:31 (as C. 

 longifolia). L.B.C. 20:1983 (as C. retusa). J.H. III. 

 3.-):35. 



OXYPfiTALUM (Greek, sharp petal). Asclepiaddcetr. 

 <>. <ii ntlfiim is a tender twining herb from the Argen- 

 nni- Ki public with changeable 5-lobed fls. about an inch 



OYSTER PLANT 



across. The fls. are said to be pale blue when they first 

 open, then purplish, and when withered lilac. Not cult, 

 in America, but apparently desirable for cultivation here. 

 The following are perhaps obtainable from Europe: O. 

 (ippendiculatum, ^ith pale yellow, fragrant fls.; O. 

 ' ■ " and O. solanoides, blue, 



f alii.iit 50 species, mostly 

 V I'.razilian herbs or sub- 

 , "iiiii.site: calyx 5-parted: 

 liiil: -.-ales of the corona 5, 

 oruUa and staminal tube. 



the 



caertileum, Dene. Downy: Ivs. short-petioled, oblong, 

 one of each pair of the upper Ivs., .3-4-ttd. : corolla-lobes 

 but cordate-hastate at the base: peduncles axillary from 

 spreading : scales of the corona 5, erect, darker blue, 

 fleshy, exserted, recurved and notched at the apex. 

 B.M. 3630 [Tweedia versicolor). 



OXYTEOPIS (Greek, sharp keel). Legiiminbs(r. 

 Three Colorado wild flowers are ofliered under this 

 name. The lis. are pea-shaped, borne in spikes, and 

 range from white through blue and iMirpU- to i-rinison. 

 The plants are tufted, and the l\->. n. ..M i innate, 

 have 7-16 pairs of Ifts., and are .:- lute 



beneath. O. iamfteWi is one of man : i iiave 



been charged with being the "Lorn i inins 



western horses. This genus, acconli i, I I - . i nno 



( Pittonia 3:208), should be ret. 1 1 . ' . . llu^. 

 .Aragallns is reviewed in Erythi-a 7 , ' . :- -i Imt 

 the genus is not defined. It is clos.-h i -i . ; ra-- 



alus. and differs essentially in the 'piil i l- n-ially 



2-celled instead of 1-celled. About a clo-/,en kin<ls of 

 Old World Oxytropis said to be cult, in Europe, mostly 

 in rockeries. They are hardy, easily prop, by seed or 

 by division, and prefer a dry, sandy loam. These 

 plants are of very minor value horticulturally. 



A. Stipules free: pod l-htvuhd. 

 defUza, DC. {Aragdllus deflixus. Heller). A toot or 

 less high: Ifts. crowded in 12-16 pairs, lanceolate to 

 oblong, 3-6 lines long : fls. about 3 lines long : pod 

 1-celled. Mts., Brit. Amer. to Colo, and Utah. -Very 

 distinct species, by reason of its stipules. 



AA. Stipules adnate to the petiole: pod 2-loculed, 



L&mbertii, Pursh (Aragdllus Lamherti, Greene). 

 Lfts. about 7 pairs, 4-16 lines long: spike sometimes 

 short-oblong, densely fid., often long and sparsely fld.: 

 fls. 1 in. across, typically purple or violet; calyx not 

 inflated, distinctly surpassed by the mature pod : pod 

 turgid but not membranous-inflated, more or less 

 leathery, subterete, neither glandular nor viscid, im- 

 perfectly 2-loeuIed or less. Common on the prairies. 

 B.M. 2147 (dark blue). B.R. 13:10.54 (blue). V. 3:138.- 

 AvenNelson.inErythea7:62.saysthat the species should 

 be restricted to the purple- and violet-fld. forms. D. M. 

 Andrews offers a crimsontlcl. form, and also var. spi- 

 c4ta, which has large spikes ..f white tls. \y ^j 



OXYtTRA. 



Lai, 



OYSTER PLANT or SALSIFY. Tragopogon pom- 



