PLATANACEJE. (rLANE-TREE FAMILY.) 417 



beneath; pedicels and calyx smaller. — Swamps of the Apalachicola River, 

 Florida. Jan. and Feb. — A small tree. 



4. XT. alata, Michx. (Whahoo ) Branches corky-winged ; leaves small, 

 ovateJanceolate, acute, sharply serrate, commonly even and rounded at the base, 



rough above, pubescent beneath, nearly sessile , flowers clustered, on slender 

 pedicels; fruit oval, downy on the margins. — Rich soil, Florida to North Car- 

 olina, — A small tree. Leaves 1'- 1|' long. 



2. PLANERA, Gmcl. Planer-Tree. 



Flowers polygamous, clustered. Calyx hell-shaped, 4 - 5-cleft.- Stamens 4 - 5 : 

 anthers extrorse. Ovary 1-celled. Styles short. Fruit nut-like, coriaceous, 

 wingless. Embryo straight, without albumen. — Small trees, with the foliage of 

 the Elm. 



1. P. aquatica, Gmel. Leaves ovate, short-petioled, acute, serrate, rough- 

 is'.i ; flowers in small roundish clusters, appearing before the leaves ; nut ovate, 

 covered with warty scales. — River-swamps, Florida to North Carolina. Feb. 

 and March. — A tree 20° -30° high. Leaves 1' - U' long. 



3. CELTIS, Toum. Nettle-Tbee. 



Flowers perfect or polygamous, apetalous. Calyx of five sepals. Stamens 5 : 

 anthers introrse. Ovary 1-celled. Styles 2, slender, pubescent. Drupe globose. 

 Embryo curved around scanty gelatinous albumen. Cotyledons wrinkled. — 

 Trees Leaves petioled, commonly oblique at the base. Flowers axillary, soli- 

 tary, or few in a cluster, greenish. 



1. C. OCCidentalis, L. Young leaves and branchlets silky; leaves (2' 

 long) ovate, acuminate, sharply serrate, abruptly contracted at the base, soon 

 smooth, ferrugineous beneath ; fertile flowers mostly solitary, on drooping pe- 

 duncles ; the sterile ones 2 - 4 in a cluster ; drupe dark purple, with a thin sweet 

 pulp. — Rich soil, Georgia, and northward. March. — A tree 40° - 60° high. — 

 Var. ixtegrifolia. (C. integrifolia, Nutt.) Leaves ovate or ovate-lanceolate 

 (2' -3' long), acuminate, entire, rounded, or the lower ones cordate at the base, 

 roughened with minute elevated points. — Sandy soil, Apalachicola, Florida 

 (perhaps introduced), and westward. — A small tree. Branches and leaves 

 2-ranked. — Var. pcmila. (C. pumila, Pursh.) Shrubby; leaves (l'-H' 

 long) ovate, acute, serrate, obtuse at the base, pale beneath, very rough above ; 

 drupe glaucous. — Shady woods, Florida to North Carolina. March and April. 

 —Stem 5° -10° high. 



Order 126. PLATANACE^. (Plane-tree Family.) 



Large trees, with alternate palmately-lobed petioled stipulate leaves, 

 and monoecious flowers, in axillary long-peduncled globose heads. — Calyx 

 aud corolla none. Anthers on short club-shaped filaments, numerous, 



