ULMACE^E 



297 



petioles, numerous straight conspicuous veins forked near the margin and connected 

 by cross reticulate veinlets more conspicuous below than above, when they unfold 

 puberulous on the lower and pilose on the upper surface, at maturity thick or sub- 

 coriaceous and scabrate; stipules lateral, free, ovate, scarious, bright red. Flowers 

 polygamo-moncecious, the staminate fascicled in the axils of the outer scales of 

 leaf-bearing buds, short-pedicellate, the. pistillate or perfect on elongated puber- 

 ulous pedicels in the axils of leaves of the year in 1-3-flowered fascicles; pedicels 

 without bracts; calyx campanulate, divided nearly to the base into 4 or 5 lobes 

 rounded at the apex, greenish yellow often tinged with red; stamens inserted under 

 the ovary in the pistillate flower, sometimes few or 0; filaments filiform, erect, 

 exserted; anthers broadly ovate, emarginate, cordate; ovary ovate, stipitate, gland- 

 ular-tuberculate, narrowed into a short style divided into 2 elongated reflexed 

 stigmas papillo-stigmatic on the inner face, in the staminate flower; ovule, anatro- 

 pous; micropyle extrorse, superior. Fruit an oblong oblique drupe, narrowed below 

 into a short stipe, inclosed at the base by the withered calyx crowned by the rem- 

 nants of the style, its pericarp cnistaceous, prominently ribbed on the anterior 

 and posterior faces, irregularly tuberculate, with elongated projections, and light 

 chestnut-brown; seed ovate, oblique, pointed at the apex, rounded below, without 

 albumen; testa thin, lustrous, dark brown or nearly black, of two coats; raphe 

 inconspicuous; embryo erect; cotyledons thick, unequal, bright orange color, the 

 apex of the larger hooded and slightly infolding the smaller, much longer than 

 the minute radicle turned toward the linear pale hilum. 



The genus is represented by a single species. 



The generic name is in memory of Johann Jacob Planer, a German botanist and 

 physician of the eighteenth century. 



1. Planera aquatica, Gmel. "Water Elm. 



Leaves 2'-2^' long, '-!' wide, on petioles varying from ^'-^' in length, dark 

 dull green on the upper surface, paler on the lower surface, with yellow midribs and 

 veins. Flowers appearing with the leaves. Fruit ripening in April, ' long. 



A tree, 30-40 high, with a short trunk rarely exceeding 20' in diameter, rather 

 slender spreading branches forming a low broad head, and brauchlets brown tinged 



