ANALYTICAL KEY. li 



Leaf-sheaths spHt open opposite the blade. A palea to 



each flower within the glume GrE AMINES, p. 403. 



Flowers sohtary or crowded, without bracts, or the scale- 

 like bracts not longer than the ovary. 

 Aqviatic plant. Anthers or ovaries singly sessile in 



the axils of the leaves Naias, p. 345. 



Terrestrial plants. Stamens, ovaries, or sessile flowers 



crowded on a spadix with a spatha at the base . . AEOiDEiE, p. 311. 

 Perianth inferior, longer than the ovary. 



Pistil apocarpous (ovaries distinct) . Perianth regular, of 



3 sepals and 3 petals Sagittaeia, p. 34.-6. 



Pistil syncarpous (ovary 3-celled or rarely 1-celled). 

 Flowers closely packed in terminal compact heads, with 

 imbricated scales. 



Flowers hermaphrodite, yellow Xteis, p. 379. 



Flowers unisexual, very small. Perianth scarious 



and transparent Eeiocaulon, p. 381. 



Flowers solitary, or in spikes, racemes, or panicles. 

 Perianth petal-like, of 6 lobes or segments. 



Aquatic plants. Flowers appearing to proceed 



from the side of the petiole Monochoeia, p. 374. 



Terrestrial plants. Flowers axillary or terminal . Liliace^, p. 368. 

 Perianth double, the outer herbaceous, the inner 

 very delicate and petal-like. 

 Leaves radical, linear. Inner perianth-segments 



rolled in at the edges Thysanotfs, p. 372. 



Leaves with sheathing petioles. Petals not rolled in Commelyxace.^, p. 375. 



Perianth of 2 petal-like segments Philydeum, p. 379. 



Perianth of 6 small dry stiff segments JuNCUS, p. 380. 



Perianth superior. 



Perianth very irregidar. 



Anthers 1 or 5, on subulate or petal-like filaments. 



Leaf-veins pinnate SciTAMiNEiE, p. 347. 



Anthers 1 or rarely 2, sessile, on a central column or 



style. Leaf-veins simple Oechide^, p. 349. 



Perianth regidar or nearly so. 

 Flowers unisexual. 



Aquatic plant. Stamens 8 or 9. Female perianth 



with a long tube Blyxa, p. 347. 



Terrestrial twiners. Stamens 6. No tube to the 



perianth Dioscokea, p. 367. 



Flowers hermaphrodite. 



Stamens 6 ...... Amaeyllide^, p. 365. 



Stamens 3. 



Perianth tubular. Small, slender, leafless plant . Gonyanthes, p. 364. 

 Periantli of 6 spreading segments. Leaves equi- 



tant Paedakthus, p. 365. 



CLASS III. CRYPTOGAMS. 

 (See p. 435.) 



