2420 



OXYDENDRUM 



OXYTROPIS 



1 -sided racemes; calyx divided nearly to the base 

 into 5 sepals yalvate in bud; corolla cylindric-ovoid, 

 puberulous, with 5 minute lobes; stamens 10; anthers 

 linear-oblong, opening from the apex to the middle; 

 style slightly exserted: caps, ovoid-pyramidal, 5-valved, 

 loculicidally dehiscent, many-seeded; seeds slender, the 

 reticulate loose seed-coat produced at the ends into 

 slender points. One species in E. N. Amer. 



A handsome medium-sized tree with slender spread- 

 ing branches, rather large, generally oblong bright 

 green leaves turning scarlet in fall and with small white 

 flowers, followed by small grayish capsules nearly as 

 conspicuous as the flowers. It is hardy North and of 

 easy culture in any moderately good soil, but rather 

 slow in becoming established and of rather slow 

 growth. It is useful in shrubberies, along the borders 

 of woods, or even within the woodland, since it endures 

 shade fairly well. Propagation is by seeds treated like 

 those of Andromeda. 



arboreum, DC. (Andromeda arbdrea, Linn.). Fig. 

 2692. Tree with deeply fissured bark, occasionally to 

 60 ft. high: branchlets glabrous: Ivs. slender-stalked, 

 oblong-lanceolate, acuminate, broadly narrowed at the 

 base, serrulate, glabrous except a few hairs on the mid- 

 rib, 4-7 in. long: panicle 6-10 in. long; fls. K m - long: 



2692. Oxydendroum arboreum. Sour-wood or 

 sorrel-tree. 



caps. H~/^ m - long. June- Aug.; fr. in Sept., Oct. Pa. 

 to Ind. and along the mountains to Fla. and La. 

 S.S. 5:235. B.M. 905. L.B.C. 13:1210. G. 27:415. 

 F.E. 24:131. M.D.G. 1904:253. ALFRED REHDER.! 



OXYLOBIUM (Greek, sharp pod). Including 

 Calllstachys. Legwninbsse. One of many genera of 

 Australian shrubs with pea-like flowers which are little 

 known in cultivation. 



Undershrubs or shrubs: Ivs. very short-stalked, 

 opposite or more or less whorled, rarely scattered or 

 alternate: fls. in terminal or axillary racemes; petals 

 clawed; stamens free; ovary villous, sessile or stalked, 

 4-30-ovuled. Nearest to Chqrizema, but the keel is 

 about as long as the wings, while in Chorizema the keel 

 is much shorter. The following species was considered 

 the type of another genus; it is distinguished from all 

 other species of Oxylobium by the incomplete dehiscence 

 of the pod. Species nearly 30, 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. Callistachys is perhaps the best for con- 

 servatories. In America it is cult, only in S. Calif. 



Callistachys, Benth. Tall shrub : Ivs. mostly in irregu- 

 lar whorls of 3, varying from ovate-oblong and 1^-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. 216 (as Callistachys 

 lanceolata). B.M. 1925 (as C. ovata). P.M. 8:31 (as 

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

 3 5 -35. WILHELM MILLER. 



OXYPETALUM (Greek, .sharp petal). Incl. Tweediea. 

 Asclepiadacese. S. American and largely Brazilian 

 herbs or subshrubs, twining or not: Ivs. opposite: calyx 

 5-parted; corolla deeply 5-cut, short-tubed; scales of 

 the corona 5, fastened at the base of the corolla and 

 staminal tube. Species about 100, not widely known 

 in cult. 



caerftleum, Decne. Herbaceous, but more or less 

 woody below, downy: Ivs. short-petioled, oblong, but 

 cordate-hastate at the base: peduncles axillary from 

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

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

 blue, fleshy, exserted, recurved and notched at the 

 apex. B.M. 3630 (as Tweediea versicolor). 0. cxru- 

 leum is a tender twining plant from Argentina with 

 changeable 5-lobed fls. about an inch across. The fls. 

 are said to be pale blue when they first open, then 

 purplish, and when withered lilac. Not cult, in Amer., 

 but apparently desirable for cult. here. 



solanoides, Hook. & Arn. ( Tweediea florib unda, Hort.). 

 Erect, little branched, shrubby or somewhat so, 6 ft.: 

 Ivs. lanceolate to oblong-cordate, acute, tomentose, the 

 sinus at the base deep: fls. not so large as in 0. cseruleum, 

 bluish tinged rose (or dull purplish red), in terminal 

 or axillary few-fld. cymes; staminal crown of 5 fleshy 

 parts. Brazil. B.M. 4367. L H. B.f 



OXYPOLIS (derivation not explained) . Umbelliferse. 

 A few erect glabrous wet-ground perennials in N. Amer., 

 seldom used in bog- and swamp-gardening; formerly 

 known as Tiedemannia. The plants have tuberous 

 clustered roots: Ivs. pinnate or ternate, sometimes 

 reduced to hollow and jointed phyllodia: fls. small, 

 white, in compound mostly involucrate and involucel- 

 late umbels: fr. glabrous, ovate or obovate, dorsally 

 flattened, ribbed or winged. 0. rigidius, Raf. (Tiede- 

 mdnnia rigida, Coult. & Rose), COWBANE, is a poison- 

 ous herb, 2-6 ft. tall, growing in swamps, N. Y. to 

 Minn, and Fla., which was once offered in the trade: 

 Ivs. pinnate; Ifts. oblong to ovate-lanceolate or nearly 

 linear, entire or sparsely dentate. Probably not now 

 listed. 



OXYTENANTHERA: Bamboo. 



OXYTROPIS (Greek, sharp keel). Leguminbsse. 

 Perennial herbs, half-shrubs and shrubs. 



The genus is like Astragalus, but is distinguished by a 

 subulate beak at the tip of the keel. The American 

 species are tufted with numerous short sts. from a hard 

 and thick rootstock: Ivs. odd-pinnate with 7-16 pairs 

 of Ifts., which are woolly and white beneath: calyx 

 tubular or tubular-campanulate : fls. pea-shaped (papil- 

 ionaceous), with an erect standard, wings elongated, 

 keel occasionally with thorn-like apex, longer or shorter 

 than the wings, in racemes, spikes or heads and range 

 from yellow, white through blue and purple to crimson : 

 pods many-seeded. About 234 species with the center 

 of their distribution in Asia from Siberia to the Caucasus 

 Mts. and Turkestan. A few species reach the moun- 

 tains of Cent. Eu. None occurs in Afr. About 18 

 species found in the Rocky Mts. are referred to Aragal- 

 lus, a generic name brought into prominence by E. L. 

 Greene (Pittonia 3:208) and reviewed in Erythea 

 7:57-64 (1899) without definition. O. Lambertii is 

 poisonous to stock. It is one of the most characteristic 

 loco-weeds of the W. (see Poisonous Plants). Locoed 



