ANALYTICAL KEY. li 



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



each flower within the glume Geamineje, p. 403. 



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

 like bracts not longer than the ovary. 

 Aquatic 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 . . Aeoide.e, p. 341. 

 Perianth inferior, longer than the ovary. 

 Pistil apocarpous (ovaries distinct). Perianth regular, of 



3 sepals and 3 petals Sagittaria, p. 346. 



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

 Flowers closely packed in terminal compact heads, with 

 imbricated scales. 



Flowers hermaphrodite, yellow Xyeis, 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 Thysanotus, p. 372. 



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



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



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



Perianth superior. 



Perianth very irregular. 



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



Leaf-veins pinnate Scitamine-E, p. 347. 



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



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



Perianth regular 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 Dioscoeea, p. 367. 



Flowers hermaphrodite. 



Stamens 6 Amaeyllide^:, p. 365. 



Stamens 3. 

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

 Perianth of 6 spreading segments. Leaves equi- 

 tant Paedanthtjs, p. 365. 



CLASS III. CRYPTOGAMS. 

 (See p. 435.) 



