Halesia 



1601 



foliage and stellate pubescence similar to that of the species of Halesia. Pterostyrax 

 differs from the latter as follows : Branchlets with solid pith. Flowers numerous 

 in axillary and terminal panicles, arising on the current year's branchlets ; corolla 

 five-partite ; stamens ten, exserted, unequal. Fruit small, either obovate and 

 five-winged, or cylindric and ten-ribbed. 



Of the three species, one appears to be in cultivation, 1 and deserves a brief 

 mention : 



Pterostyrax hispida, Siebold and Zuccarini, in Abh. Akad. Miinchen, iv. 3, 

 p. 132 (1846). A small tree, 20 to 30 ft. high, native of the main island of Japan 

 and central China, which was introduced 2 about 1870. It is perfectly hardy at 

 Kew, coming into flower late in June, and ripening occasionally its seed. 

 It was lately figured in Bot. Mag. t. 8329 (1910) from a specimen in Canon 

 Ellacombe's garden at Bitton. (A. H.) 



HALESIA DIPTERA 





Halesia diptera, Ellis, in Phil. Trans, li. 931, t. 22 b (1761); Linnaeus, Sp. PL 636 (1762); 



Loudon, Arb. et Frut. Brit. ii. 1191 (1838); Perkins, Styracacea, 97 (1907); Schneider, 



Laubholzkunde, ii. 583 (191 1). 

 Halesia reticulata, Buckley, in Proc. Acad. Sci. Philad. i860, p. 444. 

 Mohria diptera, Britton, in Garden and Forest, vi. 434 (1893). 

 Mohrodendron dipterum, Britton, in Garden and Forest, vi. 463 (1893) ; Sargent, Silva N. Amer. vi. 



2 3> * 2 S9 (!894), and Trees N. Amer. 756 (1905). 



A large shrub or small tree, not exceeding 30 ft. in height. Young branchlets 

 with a few very scattered stellate hairs. Leaves membranous, ovate, 4 to 5 in. long, 

 2 h to 3i m - wide, acuminate at the apex, rounded or cuneate at the base ; margin 

 with remote serrations tipped with long cartilaginous points ; glabrous on both 

 surfaces, except for scattered stellate hairs on the midrib and nerves ; green 

 beneath ; petiole about ^ in. long, with slight stellate pubescence. 



Flowers on long slender pedicels, in fascicles of three or four ; calyx pubescent 

 externally, with four short distinct triangular teeth ; corolla white, divided nearly to 

 the base into four or five lobes ; stamens usually eight, rarely ten to sixteen with 

 pubescent filaments, which are united together in their lower half; ovary usually two-, 

 occasionally three-celled, tomentose ; style tomentose. Fruit oblong, compressed, 

 i| to 2 in. long, with two large opposite wings, and two or three additional slight 

 ridges ; stone narrowly obovate, conspicuously furrowed ; seeds acuminate at 

 the ends. 



This is a native of the coast region of the United States, from South Carolina 

 to northern Florida, and westward to Texas, ascending in the Mississippi valley to 



1 The other species, not yet introduced are : 



(1) Pterostyrax psilophylla, Diels, ex Perkins, Styraeacea, 1 03 (1907). A shrub found by Wilson in central China, 

 closely allied to P. hispida. 



(2) Pterostyrax corymbosa, Siebold and Zuccarini, Ft. Jap. 96, t. 47 (1835). A shrub, native of Japan. 



2 Cf. Koch, Dendrologie, ii.pt. i. 198 (1872). 



