ANALYTICAL KEY. 43 



"Flowers axillary. Perianth none, or of four small scales. 



Naiad Fam. (p. 48i).) 

 Flowers in globular beads, the upper head male, the lower female. 

 q, J Perianth none, or of 1 to 6 small scales. 



"^ Floating Spaeganium (p. 486.) 



Flowers glumaceous. Stamens 2 or 3 . Floating Scieptjs (p. 550.) 

 Perianth of 6 parts. Stamens 6 . . . . Jointed Rush (p. 537.) 

 Perianthof Sparts. Stamens aboutS. AmpMhious'S oi.YGO'iiV'!^ (p. 451.) 



2. Terrestrial Herbs, or, if aquatic, erect. 



'Flowers hermaphrodite, containing one or more ovaries and one 



or more stamens, surrounded by a distinct perianth .... 93 

 Flowers diclinous, the stamens and ovaries either in separate pe- 

 rianths, or intermixed or variously arranged on the same spike, 

 or within the same involucre, but separated by single scales 



only, without distinct perianths 124 



' Stamens more than 6 94 



\ Stamens 6 or fewer 101 



" Stamens indefinite, usually numerous 95 



Stamens about 12 96 



Stamens 7 to 10 97 



' Stamens inserted on the receptacle. Ovaries numerous. 



Eantjnculus Fam. (p. 53.) 

 Stamens on the calyx. Ovaries few or single . Rose Fam. (p. 183.) 

 " Perianth three-lobed. Capsule sessile . . Asaefm Gen. (p. 455.) 

 Perianth (involucre) with five small lobes or teeth. Capsule 



stalked Sptjege Gen. (p. 456.) 



, r Leaves radical, or in a single whorl on the stem 98 



Leaves alternate or opposite 99 



'Leaves once or twice temately divided. Flowers in a small ter- 

 minal head Adoxa Gen. (p. 268.) 



Leaves entire, rush-like, radical. Flowers in a terminal umbel. 



Plant aquatic BuTOiiE Gen. (p. 495.) 



Leaves entu-e, in a single whorl of four or five. Flowers solitary, 



terminal Paeis Gen. (p. 522.) 



rLeaves orbicular, crenate. Capsule inferior, many-seeded. 



Chexsosplene Gen. (p. 232.) 

 Leaves entire. Capsule several-seeded . . . Piyx Fam. (p. 212.) 



[^Leaves entire. Capsule one-seeded 100 



-i(vn\ Leaves small, opposite. Capsule inferior. Scleeanth Gen. (p. 219.) 

 \ Leaves alternate, with sheatliing stipules. PoLTQONtrii Gen. (p. 448.) 



r Perianth coloured, and looking like a corolla 102 



101 < Perianth herbaceous, and looking like a calyx or scales, or en- 



[ tirely wanting 110 



rOne or two anthers sessile on a central column or style. One of 

 10-? J *'^® ®^ divisions of the perianth different from the others. 



^1 Oechid Fam. (p. 500.) 



L Three to six stamens distinct from the style 103 



10^/ Leaves opposite or in whorls 104 



\ Leaves alternate or radical 106 



r Stamens 6. Capsule two-celled,with several seeds. Peplis Gfew. (p. 214.) 



104 •< Stamens 5 or fewer. Ovary inferior 53 



[ Stamens 5. Ovary superior 105 



92. 



93- 

 94 



95 ■{ 



96 

 97 



98 



m\. 



