1464 



PTERIS 



PTEROCARYA 



9. tr6mula, R. Br. Lvs. 2-4 ft. long, on polished 

 chestnut-brown stalks; upper pinnae simply pinnate, 

 lower often much compound: sori copious, sometimes 

 filling up the whole segment except the rachis. Australia, 

 New Zealand. Many forms occur in cult, as var. Smith - 

 iana (P. Smithii, Hort.), variegata, etc. 



2012. Pteris Cretica, var. albo-lineata. 



10. scab6rula, Richard. Lvs. 12-18 in. long, on brown- 

 ish scabrous stalks, lanceolate-ovate in outline, tripin- 

 nate or quadri-pinnatifid throughout; rachis flexuous, 

 scabrous; sori at maturity covering nearly the entire 

 surface of the narrow lanceolate segments. New Zea- 

 land. 



11. biaurita, Linn. (P. maxima, Baker. P.nemordlis, 

 Willd.). Lvs. 15-30 in. long, with a terminal pinna 6-9 

 in. long cut into narrow round-pointed divisions on 7-10 

 pairs of similar lateral ones, the lowest pair bearing a 

 fork on the lower basal side. All tropical regions. 

 Habit very like P. quadriaurita, from which it differs 

 chiefly in the venation. Var. cristata (P. maxima, var. 

 cristata, Hort.) is a cult. form. 



12. Wallichiana, Agardh. Lvs. tripartite, with the 

 lateral divisions again forked, the central one reaching 

 2 ft. long, with numerous lanceolate sessile opposite 

 pinnules, cut again into numerous narrow lobes one- 

 eighth in. wide. India, Japan and the Philippine Islands. 



13. leptophylla, Swz. Lvs. deltoid, 9-12 in. each way, 

 on straw-colored stalks ; upper pinna simple, those 

 below pinnatifid to a winged rachis, the lowest similarly 

 bipinnatifld at the base; veins fine; sori not reaching 

 the tips of the segments. Brazil. 



The following are mostly synonyms and trade names that 

 cannot be accounted for by the writer: P. adiantoldes.P. 

 aquillna. See Pteridium. P. Chinensis is possibly a var. of 

 P. serrulata. P. geranifblia is a species of Doryopteris. P. 

 hastdta = Pellaea hastata. P. palmdta possibly referable to 

 Doryopteris. P. plumbsa.P. regina.P. Sieboldii.P. Suor- 

 drdii.-P. Wimsetti. L. M. UNDERWOOD. 



PTEEOCABYA (Greek, pteros, wing, and karya, nut; 

 referring to the winged nuts). Juglanddcece. Orna- 

 mental deciduous trees, with large, alternate, pinnate 

 Ivs., rather inconspicuous greenish fls. in pendulous 

 catkins, and long, pendulous racemes of small, winged 

 fruits. The three cultivated species are hardy as far 

 north as Massachusetts, except some tender varieties of 

 P. stenoptera. They are handsome trees of rapid growth, 

 with graceful dark green foliage, decorated in summer 

 and fall with the long, drooping racemes of light green 

 fruits. They thrive best in rich and moist soil, but also 



grow in drier localities. Propagated by seeds sown iu 

 fall or stratified, and by layers and suckers. 



A genus of about 7 species in the Caucasus region 

 China and Japan. Branches with lamellose pith: Ivs. 

 odd-pinnate, with almost sessile Ifts. : fls. monoecious, in 

 pendulous catkins, appearing with the Ivs.; staminate 

 catkins rather dense, fls. consisting of 3 connate bracts, 

 1-4 sepals and 6-18 stamens; pistillate catkins slender, 

 the 1-celled ovary enclosed in a connate involucre elon- 

 gated into a 4-toothed beak, stigmas 2: fr. a small 1- 

 seeded, winged nut, 4-celled at the base. In germination 

 the 4-lobed cotyledons are borne above the ground and 

 become green, while in Juglans and Hicoria they remain 

 inclosed in the nuts. 

 A. Winter-buds naked, iisually several in each axil. 



fraxinifdlia, Spach. (P. Caticdsica, C. A. Mey.). Tree, 

 to 60 ft., with spreading branches, of ten rising in several 

 stems from the ground: Ivs. 8-15 in. long, with glabrous 

 terete rachis; Ifts. 11-25, oblong to oblong-lanceolate, 

 acute or acuminate, serrate, pubescent only in the axils 

 of the veins beneath, 2-4 in. long: stamens 10-16: fr. 

 with semi-orbiculate wing, about % in. broad, in racemes 

 to 18 in. long. W. Asia. Gn. 34, p. 219. G.C. III. 4:381. 

 P. Spachidna, Lav. (P. duMosa, Lav.), is hardly dif- 

 ferent, except that it is more shrubby and tender. 



stendptera, DC. (P. f Sine"nsis, Hort. P. Japdnica, 

 Hort.). Fig. 2013. Tree, similar to the preceding: Ivs. 

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

 neath; Ifts. 11-21, oblong, acute, serrate, pubescent be- 

 neath on the midrib, 2-4 in. long: stamens 6-10: fr. 

 with oblong or oval-oblong, usually upright wings di- 

 verging at a narrow angle. China. This is a variable 

 species, and the varieties are of different degrees of 

 hardiness. The form cultivated in the Arnold Arboretum 

 has proved as hardy as the preceding species. 

 AA. Winter-buds covered with 2-3 dark brown, large 

 scales, falling off early in spring: accessory 

 buds wanting. 



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

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

 ing branches: Ivs. 8-15 in. long, with terete-pubescent 

 or almost glabrous rachis; Ifts. 11-21, oblong or oblong- 

 lanceolate, acuminate, pubescent on the veins beneath 



2013. Pterocarya stenoptera (X 1-5). 



or almost glabrous, 2-4 in. long: fr. with a broad 

 rhombic wing, about 1 in. across. Japan. S.Z. 2:150. 

 This species is an important forest tree in Japan and 

 has proved hardy at the Arnold Arboretum. 



A.LFKED REHDER. 



