PLATANACE^. (PLANE-TREE FAMILY.) 417 



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

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



4. U. alata, Michx. ("Whaiioo ) Branches corky-winged ; leaves small, 

 ovate-lanceolate, acute, sharply serrate, commonly even and rounded at the base, 

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

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

 olina. — A small tree. Leaves 1'- 1^' long. 



2. PLANERA, Gmel. Planer-Tree. 



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

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

 wingless. Embryo straight, Avithout albumen. — Small trees, with the foliage of 

 the Elm. 



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

 ish ; 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, Tourn. Nettle-Tree. 



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 branchlcts silky; leaves (2' 

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

 smooth, ferrugincous 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. integrifolia. (C. integrifolia, Xutt.) 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. pumila. (C. pumila, Pursh.) Shrubby; leaves (l'-l|' 

 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^E. (Plane-tree Family.) 



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

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

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



