PITTOSPORUM 



PLANER-TREE 



2655 



fnst, Hillebrand. Lvs. ample, acute, 7-10 in. long. 2-3 in. wide, 

 sparsely to silvery hairy beneath: fls. in terminal clusters, cream- 

 color. Hawaii. P. hettrophyUum, Franch. Half -reclining: Ivs. 

 medium-sized, ovate, acute, glabrous: fls. few, terminating short 

 branchlets, light yellow. China. Offered by Franceschi for rock- 

 eries and embankments: drought-resistant. P. iUicioides, Makino. 

 A handsome evergreen shrub: Ivs. glossy green: fls. greenish yel- 

 low. Japan. In general appearance resembles Illicium anisatum. 

 P. Kirkii, Hook. f. Glabrous shrub: Ivs. narrow-obovate, very 

 thick, obtuse: fls. yellow, in terminal umbels. New Zeal. P. 

 Rdlphii, Kirk. Shrub, related to P. crassifolium but If.-margin not 

 revolute: Ivs. white-tomentose beneath: fr. 8 lines long, pubescent. 

 New Zeal. G.C. III. 26:205 (as P. crassifolium). P. tetraspir- 

 mum, Wight & Arn. Shrub: Ivs. ovate, acute, 2-4 in. long, gla- 

 brous: fls, terminal, yellowish: fr. glabrous, 4-seeded. India. 



HARVEY MONROE HALL. 



PITYROSPERMA: C.mici/uflo. 



PLACEA (possibly derived from a Chilean name). 

 AmaryUiddc&e. Rare and beautiful Chilean bulbs, of 

 difficult culture, bearing showy flowers something like 

 an amaryllis (Hippeastrum), the colors being white or 

 yellow, streaked with red. 



Perianth funnel-shaped, with scarcely any tube; 

 corona funnel-shaped, inserted at the base of the segms., 

 deeply cut, the divisions notched, stamens inserted 

 inside the corona; ovary top-shaped, 3-celled; ovules 

 many, superposed; styfe declinate; stigma capitate, 

 obscurely 3-lobed. Five or six species. Botanically the 

 peculiar feature of Placea is its cup or corona, which is 

 smaller than that of Narcissus, and red instead of 

 yellow or white. The beauty of the placeas, however, 

 is of the hippeastrum type, though the fls. are not so 

 symmetrical, for at first sight it looks as if two of the 

 perianth-segms. were torn away. The peduncle is long 

 and hollow. 



Placeas are generally classed as autumn-flowering 

 bulbs. Though natives of the Andes at considerable 

 elevations, they are not hardy. The bulbs are said to 

 lie deep in the ground in their native country, and pot 

 culture is generally considered unsuitable for deep- 

 lying bulbs. The bulbs go to rest about August and 

 push up about December, flowering in May. In a pot 

 they ought to have their time of rest, and must be 

 buried in the soil, which ought to be very rich, but in 

 pots they are not certain to flower. They must be 

 planted with at least an inch of soil over their necks, 

 and the\* prefer a loose soil. 



ornata, Miers. Bulb 1 in. thick: Ivs. 2, linear, appear- 

 ing with the fls. : scape 6-9 in. high; umbel 4-6-fld. ; per- 

 ianth-segms. 1-1 y^ in. long. B.R. 27:50. Gn. 54:510. 



P. grandifldra, Lem., is thrice as big as P. ornata, more florifer- 

 ous, and is essentially distinguished by its perianth-segms., which 

 are more acuminate and sharp-pointed. I.H. 15:574. F.S.20:2047 



WILHELM MILLER. 



PLAGIANTHUS (Greek, oblique flower). Malvaceae. 

 Trees or shrubs, rarely herbs, with large or small white 

 5-petaled flowers, little known in this country. 



Bractlets none or distant from the calyx, which is 

 5-toothed or cut; column of stamens divided at the 

 apex into many filaments; cells of ovary 2-5, rarely 1 or 

 many; ovules solitary, pendulous: carpels in a single 

 series: style-branches longitudinally stigmatose within: 

 foliage and infl. various. Distinguished from Abutilon 

 by the number of ovules. About 12 species from 

 Austral., Xew Zeal., and Van Dieman's Land. They are 

 hardy in the most favored parts of England. None of 

 the species is offered in America. They are known as 

 "ribbon trees." 



Lampenii, Booth. Botanically only a variety of P. 

 pulchellus, but horticulturally very much superior. 

 Shrub, attaining 6-8 ft.: Ivs. oblong-lanceolate, 4-5 x 

 ^2~l in., sharply serrate: fls. in short, axillary leafy 

 panicle.?, very numerous and crowded; styles very 

 small. Van Dieman's Land. G.C. II. 22:201. 



pulchellus, Gray (Abutilon pulcheUum, Sweet. A. 

 pulchrum, Don). Tall shrub: Ivs. lanceolate, cordate, 

 acuminate, 2-3 in. long, coarsely crenate: fls. few, 



clustered along rachis of axillary racemes; ovary 

 5-elled. Austral. B.M. 2753 (as Sida pulchella). 



P. bttulinus, A. Cunn. RIBBON-WOOD. Tree, 30-60 ft. high, 

 with trunk sometimes 3 ft. diam.: Ivs. of mature plants 1-3 in. 

 long, ovate or ovate-lanceolate, acuminate: fls. small, unisexual, 

 in terminal or axillary decompound panicles, yellowish white. 

 New Zeal. Said to be used by the Maoris for making rope and 

 twine. For P. Lyallii, Hook., see under Gaya, Vol. Ill, p. 1319, 

 additional illustrations of which are G. 32:543; 35:677. G.M. 55: 

 572. Gn. 44:28; 75, p. 372. G.C. III. 4:2O9; 41:332,335. H.F. 



WILHELM MILLER. 



PLAGIOBOTHRYS (Greek, plagios, sideways, and 

 bothros, pit or hollow; wherefore the name should have 

 been written Ploffiobothrus) . Boraginacex. Several 

 species of low-growing commonly diffuse annuals from 

 W. Amer., with small white fls. Here belongs P. notho- 

 fulvus, Gray, from Calif, to Wash., which was once 

 advertised under its synonym Eritrichium nothofulnim, 

 Gray. This plant has no horticultural standing. 



PLAGIOGtRLA. (Greek, oblique and round, alluding 

 to the oblique ring around the sporangium). Poly- 

 podiaceae. Warm-country ferns, formerly included as a 

 section under Lomaria. 



Sori inserted on the more or less thickened ends of 

 the forked side-nerves, finally often confluent, usually 

 covered by the revolute margin; indusium lacking; 

 sporangia long-stalked with a complete oblique ring; 

 spores tetrahedral: Ivs. tufted, simple-pinnate, dimor- 

 phous; petiole fleshy-swollen at the base, the upper side 

 of which has 3-6 spongy protuberances; sterile Ivs. 

 serrate; fertile Ivs. smaller, mostly entire. About 10 

 species, in tropics of New World, in the Philippines, 

 Formosa, S. China. 



costaricensis, Mett. (Lomaria costaricensis, Baker). 

 A plant requiring warmhouse cult. : sterile Ivs. 1 ft. and 

 more long and about hah" as wide, with entire falcate 

 Ifts. which are less than J^in. broad and united at then- 

 bases, thereby forming a winged rachis; fertile Ivs. 

 1 j/2 ft. long and 6 in. broad, with contracted Ifts. Costa 

 Rica. 



PLAGIOSPERMUM: Prinsepia. 



PLANERA (after J. J. Planer, 1743-1789, professor 

 of medicine at Erfurt; author of several books on 

 botany). Urticacese. WATER- ELM. Monotypic genus, 

 allied to Ulmus and Celtis: Ivs. pinnately veined, 

 alternate: fls. polygamous, with deeply 4 5-lobed calyx; 

 staminate fls. short-stalked, in clusters at the base of 

 the young branchlets, with 4-5 stamens; pistillate or 

 perfect ones on rather slender stalks, 1-3 in the axils 

 of the lower Ivs. : fr. a small muricate nut. The only 

 species is P. aquatica, Gmel. (Anonymus aquations, 

 Walt. P. ulmifolia, Michx.). Small tree, sometimes 

 to 40 ft.: Ivs. short-petioled, somewhat unequal at 

 the base, ovate to ovate-oblong, unequally serrate, gla- 

 brous at length and somewhat leathery, 1^6-2^ in. 

 long: fr. oval, H m - long, with irregularly crested fleshy 

 ribs. April, Mav. S. 111. and Ky. to Fla. and Texas. 

 S.S. 7:316. R.H. 1903, p. 351. This tree is not in 

 general cult, and has little to recommend it as an orna- 

 mental plant. It would not prove hardy N. It probably 

 thrives best in moist soil and is prop, by seeds sown soon 

 after ripening in May and by layers, also by grafting 

 on elm. The 'plants sometimes cult, under the name 

 of P. aquatica belong either to Ulmus campestris var. 

 nminalis, U. parnfolia, or U. alata, to which the true 

 Planera is similar in foliage, or to some other small- 

 Ivd. elm. 



P. acuminata, Lindl.=Zelkova serrata. P. carpinifHia, Wats. 

 =Zelkova ulmoides. P. crendio=-Zelkova ulmoides. P. Ke&kii, 

 C. Koch=Zelkova serrata. P. repent, Hort.=Ulmus pumila or 

 parvifolia, P. Ricftardi, Michx.=Zelkova ulmoides. 



ALFRED REHDER. 



PLANE-TREE: Platanus. 

 PLANER-TREE: Planera. 



