60 Spring Flora of Ohio. 



Petals 4, strap-shaped, perfect stamens and scales each 4 Hamamelis. 1 



Petals none, calyx rudimentary, stamens numerous Liquidamber. 2 



1. Genus HAM-A-ME'-LIS. — Flowers in little axillar}- clusters or 

 heads, yellow, petals lon^ ^nd narrpw; tall shrubs. 



Ham-a-me'-lis vir-gin-i-a'-na L.,— Leaves obovate or oval; blossom- 

 ing late in autumn, the seeds mattiring the next summer. 



2. Genus LIQ-UID-AIVI' BER. — Flowers usually monoecious, in 

 globular clusters; fruit a spherical hard catkin or head. 



Liq-uid-am'-ber sty-ra-cif'-lu-a. Sweet Gum: Bilsted. — Leaves deeply 

 5 to 7-lobed, smooth and shining. A large tree of extreme southern 

 Ohio. 



XXXV. Order PLAT-A-NA'-CE->E. PLANE-TREE FAMILY. Trees; 

 leaves large, palmately lobed, alternate; flowers in spherical heads. 



1. Genus PLAT'-A-NUS. — Flowers monoecious in naked spherical 

 heads, destittite of calyx and corolla; leaves palmately lobed. 



Plat-anus oc-ci-den-ta'-lis L. Sycamore. — Our largest tree; on 

 alluvial banks; the bark deciduous in brittle plates. 



XXXVI. Order R0-SA'-CE-;E. ROSE FAMILY. - Flowers with 5 

 petals (rarely wanting) and numerotis distinct stamens inserted on the 

 calyx; leaves alternate, stipulate. 



Ovary superior and not enclosed in the calyx-tube at maturity (a'. 



Ovaries inferior or enclosed on the caly.x-tube d . 

 a. Herbs c . 

 a. .Shrubs or trees [b . 



b. Shrub ; leaves palmately lobed, pods inflated Opulaster. 1 



b. Shrub ; leaves simple, pistils about "), pods not inflated Spircea. 2 



b. Shrub: leaflets -i-", crowded, petals yellow i . 



b. Biennial soft woody stems; Ivs. simple or co^iipound, pistils numerous (h). 



b. Trees or shrubs; leaves simple, pistil solitary, fruit a drupe k . 



c. Leaves thrice pinnate, flowers in a long compound panicle Antncits. 3 



c. Leaves, etc., not as above (ij . 



d. Leaves pinnate ;f). 



d. Leaves simple (e). 

 e. Cymes simple and umbel-like, fruit a fleshy pome, globular, sunk in 



at the attachment of the stalk, carpels 2-.5, papery or cartilaginous, 



2-seeded Pyrus. 4 



e. Not as above (g) . 



f. Pistils becoming achenes, enclosed in the fleshy caly.x-tube ;k). 



