2854 



PTEROCARYA 



PTEROLOBIUM 



hupehensis, Skan. Tree, to 60 ft.: branchlets gla- 

 brous or sparingly hairy: Ifts. 5-9, oblong to oblong- 

 lanceolate, acuminate, rounded at the base, serrate, 

 glabrous above, bearded in the axils of the veins 

 beneath, 3-5 in. long: racemes to 18 in. long, glandular: 

 fr. including the suborbicular wings 1-1 K in. across. 

 Cent. China. 



cc. Wings oval to oblong-lanceolate, longer than broad: 

 rachis more or less winged. 



Rehderiana, Schneid. (P. fraxinifolia x P. stenop- 

 tera). Fig. 3254. Tree, similar to P. fraxinifolia: 

 rachis of If. narrowly winged, the wings not serrulate 

 and often wanting between the lower Ifts.; Ifts. 11-25, 

 oblong to oblong-lanceolate, serrate, acute or acumi- 

 nate, pubescent in the axils beneath, 2-4 in. long: frs. 

 with oval or oval-oblong wings about J^in. long. 

 S.T.S. 2: 137. Originated at the Arnold Arboretum 

 and surpasses both parent species in vigor and hardiness. 



sten6ptera, DC. (P. sinensis, Hort. P. japonica, 

 Hort.). Tree, to 6*0 ft.: young branchlets villous: Ivs. 

 6-12 in. long, with the rachis distinctly winged and 



3254. Pterocarya Rehderiana. ( X K) 



pubescent beneath; the wings often serrulate; Ifts. 11- 

 21, oblong, acute, serrate, pubescent beneath on the 

 midrib, 2-4 in. long: stamens 6-10: fr. with oblong or 

 oblong-lanceolate, usually upright wings diverging at a 

 narrow angle. China. L.I. 19. 



BB. Frs. winged all around. 



Palifcrus, Batal. Tree, to 60 ft. : branchlets pubescent 

 while young: Ifts. 7-9, oblong-ovate to oblong-lanceo- 

 late, acuminate, serrate, the midrib beneath and also 

 the rachis pubescent, 3-6 in. long: racemes with pubes- 

 cent rachis: fr. suborbicular or oval, winged all around, 

 glabrous, 1^-2^ in. broad. Cent. China. J.H. S. 28, 

 p. 65. 



AA. Winter buds covered with 2-8 dark brown, large 

 scales, falling off early in spring: accessory buds 

 wanting. 



rhoifolia, Sieb. & Zucc. (P. sorbifdlia, Sieb. & Zucc. 

 P. lasvigata, Hort.). Tree, attaining 80 ft., with spread- 

 ing branches: branchlets glabrous: Ivs. 8-15 in. long, 

 with terete pubescent or almost glabrous rachis; Ifts. 

 11-21, oblong or oblong-lanceolate, acuminate, pubes- 

 cent on the veins beneath or almost glabrous, 2-4 in. 



long: fr. with a broad rhombic wing, about 1 in. across. 

 Japan. S.Z. 2:150. S.I.F. 1 : 16. This species is an 

 important forest tree in Japan and has proved hardy 

 at the Arnold Arboretum. ALFRED REHDER. 



PTEROCELTIS (Greek, pteron, wing; referring to 

 the winged fr. and the close affinity of the tree to Celtis). 

 Ulmacese. A deciduous tree from N. W. and Cent. 

 China, in foliage and habit very much like Celtis, but 

 with a winged fr., resembling a small elm fr. Cult, and 

 prop, like Celtis; probably hardy as far north as Mass. 

 The only species is P. Tatarin6wii, Maxim. Tree, to 

 50 ft.: branchlets glabrous: Ivs. ovate to ovate-oblong, 

 acuminate, broadly cuneate at the base, irregularly and 

 sharply serrate, 3-nerved at the base, glabrous, 1K~ 

 3J^ in. long: fr. axillary, solitary, slender-stalked, sub- 

 orbicular, often broader than high and the wing usually 

 emarginate at the apex. Rare in cult, and without par- 

 ticular ornamental qualities. ALFRED REHDER. 



PTEROCEPHALUS (Greek, wing head, so named 

 because the head appears covered with a lot of feathers 

 after the fls. fall off). Dipsacacese. Herbs, half -shrubs 

 and shrubs, annual or perennial: bracteoles narrow: 

 involucral mouth short, cilia te, pubescent; calyx-limb 

 12-24 long bristles; corolla 5-fid; mostly without palea. 

 About 20 species chiefly in the Medit. region but also 

 in Asia. This genus was formerly included in Scabiosa 

 but is now kept distinct. P. Parndssi, Spreng. (Scabi- 

 dsa Pterocephala, Linn.). A densely tufted perennial 

 with woody sts. and branches, procumbent: Ivs. nar- 

 rowed into the stout petiole, ovate, obtuse, deeply cre- 

 nate-toothed or lyrate-pinnatifid : heads depressed- 

 hemispherical; fls. lilac-pink; corolla 2-lipped, upper 

 2-lobed, lobes short rounded; lower 3-lobed, lobes 

 ovate, obtuse. Greece. B.M. 6526. Perfectly hardy in 

 England, used for carpeting in the herbaceous border 

 or suitable for rockwork. 



PTERODISCUS (Greek, wing and disk, having 

 reference to the wings of the disk of the fr.). Pedalid- 

 cese. Perennial succulent herbs: st. tuberous at the 

 base: Ivs. opposite or alternate, coarsely dentate to 

 pinnate-laciniate, rarely subentire: fls. solitary, short- 

 pedicelled in the If .-axils, yellow or purple; calyx small, 

 5-parted; corolla-tube funnel-shaped, oblique or 

 slightly gibbous at base, limb somewhat 2-lipped, lobes 

 subequal, orbicular; ovary 2-celled, cells undivided: 

 fr. indehiscent, laterally compressed, with 4 longitu- 

 dinal wings, unarmed. About 15 species in Trop. and 

 S. Afr. P. speciosus, Hook. St .-base globose :st. densely 

 glandular, 3-6 in. high: Ivs. rather numerous, crowded 

 in the upper part of st., linear to linear-oblong: calyx- 

 segms. lanceolate, acuminate; corolla bright red-purple: 

 fr. suborbicular, cordate at base. Trop. and S. Afr. 

 B.M. 4117. G.Z. 21, p. 49. P. luridus, Hook, f., having 

 dull yellow fls. and a native of S. Afr., is also occa- 

 sionally cult. B.M. 5784. 



PTEROLOBIUM (Greek, wing and pod; the pods 

 are produced into a wing at the extremity). Legu- 

 minosse. Woody climbers having the habit of Caesal- 

 pinia, from which they differ only in the pod: Ivs. bipin- 

 nate; Ifts. small, numerous; stipules small or incon- 

 spicuous: fls. small, white, racemose, the racemes in 

 lax panicles at the tips of the branches; calyx deeply 

 cleft, lobes imbricated; petals spreading, oblong and 

 clawed; stamens 10, free, declinate; ovary sessile, 

 1-pvuled: pod indehiscent, with a large horny oblique 

 wing. About 7 species in the tropics of the Old World. 

 P. indicum, A. Rich. (Csesalplnia Idcerans, Roxbg.). 

 Branches slender, finely downy and with minute 

 prickles: Ivs. alternate with 8-16 pinnae, 12-16 Ifts., pale 

 green: racemes copiously panicled at the end of the 

 branches; calyx with the lowest sepal longest; corolla 

 yellow, not showy. Old World tropics. Has been 



