ANALYTICAL KEY. lxix 
Perianth simple or none. 
Floating or submerged plants : ; 86 
gb. Terrestrial herbs, or, if aquatic, erect from the bottom of the water, 
and pr ojecting from it et ai ae ; ; 5 ° - 93 
Trees or shrubs. : ‘ : ; : : 5 : . 141 
1. Floating Aquatic Plants. 
Small leaf-like fronds, attached two or three together, and floating 
so} without any stem . . Lemna (p. 421.) 
Leaves and flowers growing out of a distinct stem . ; ; ys. 
87 f Leaves deeply divided into capillary lobes. : : 5 . 88 
‘Leaves entire ; . 89 
Leaves pinnately divided. Perianth 4-lobed. MvriopHyituM (p. 174.) 
88< Leaves repeatedly forked. Perianth none or many-lobed. 
CERATOPHYLLUM (p. 397.) 
: 90 
Leaves opposite or whorled . : ; : : 
89 Leaves in aradical submerged tuft .. .. _ 136 
Leaves radical in floating tufts. : _ Hyprocnaris (p. 433, ) 
ae alternate . oe 
Tube of the flower long and thread- like, resembling a pedicel, 
ELODEA (p. 433.) 
geen sessile, or nearly so, in the axils of the leaves, or in stalked 
heads or spikes, without any stalk-like tube _.. av OT 
‘One four-lobed ovary. Two styles ; . CALLITRICHE (p. 398.) 
91< Four ovaries, with distinct styles or stigmas . . NAIADE® (p. 422.) 
One simple ovaryand style . : : HIPPURIS (p. 174.) 
Flowers axillary. Perianth none, or of four small scales, 
NAIADEE (p. 442.) 
Flowers in globular heads, the upper head male, the lower female. 
92< Perianth none, or of 1 to 6small scales . SPARGANIUM (p. 419.) 
Flowers glumaceous. Stamens Zor 3. SCIBPUS fluctans (p. 482.) 
Perianth of 6 parts. Stamens6 . JUNCUS artieulatus (p. 470.) 
Perianth of 5 parts. Stamens about 5. Potygonum amphibium (p. 386.) 
2. Terrestrial Herbs, or, if aquatic, erect. 
Flowers hermaphrodite, containing one or more ovaries and one or 
more stamens . : . 94 
93 Flowers diclinous, the stamens and ovaries either in separate 
perianths, or intermixed or variously arranged on the same 
spike, or within the same involucre, but separated by single 
scales only, without distinct perianths : : : . 125 
g4f Stamens more than6 . : : : : : 6 95 
\Stamens 6 or fewer : : : = LOZ 
J Stamens indefinite, usually numerous . ‘ ; : : aco 
95; Stamens about 12. A : 2 é : : : : 97 
| Stamens 7tol0 . : : : . 398 
j Stamens inserted on the receptacle, Ovaries numerous, 
RANUNCULACES (p. 1.) 
| Stamens on the calyx. Ovaries few or single - ROSACE (p. 127.) 
a {Pen three-lobed. Capsule sessile . . ASARUM (p. 390. ) 
96: 
Perianth (involucre) with five small lobes or teeth. Capsule 
stalked . 2 ; : : : 4 EUPHORBIA (p. 391.) 
