ANALYTICAL KEY TO THE ORDERS. 
[This Key embraces all vasular plants of the Tennessee Flora. Divisions not paged are 
not represented with Medicinal species.] 
Class I. DICOTYLEDONOUS PLANTS. 
Dycotyledonous or exogenous plants have stems formed of bark, wood, 
and pith; the wood forming a zone between tbe other two, and increasing, 
when the stem grows from year to year, by the annual addition of a new 
layer to the outside, next to the bark. Leaves netted-veined. Embryo 
with a pair of cotyledons, or in Subclass II. with three or more in a whorl. 
Parts of flower in fours or fives. 
Subclass I. ANGIOSPERMiE. Pistil consisting of a closed ovary — 
cotyledons two. 
Division I. POLYPETALOUS: the calyx and corolla both present; 
the latter of separate petals. 
A. Stamens numerous , at least more than 10, and more than twice the 
sepals or lobes of the calyx. 
1. Calyx entirely free and separate from the pistil or pistils. 
Pistils numerous but cohering over each other in a solid Page 
mass on an elongated receptacle. . . Magnoliace^e, 3-4 
Pistils numerous, separate, but concealed in a hollow receptacle. 
Leaves opposite, entire ; no stipules. . . Calycanthace^e, 22 
Leaves alternate with stipules. . . . Rosa, in RosACEiE. 
Pistils several, immersed in hollows of the upper 
surface of a large top-shaped receptacle. 
Nelumbo, in Nymph^eace^e. 
Pistils more than one, separate, not inclosed in the receptacle. 
Stamens inserted on the calyx, distinct. . . . Rosace^e, 31 
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