A Synopsis of Plant Phyla 53 



anth in two whorls of three leaves each (calyx and corolla). 

 Alisnia, Sagittaria. (Pf. II, i, 22"/.) 



Family 2. Butomaceae. Aquatic or paltidose herbs, bearing 

 narrow or broad leaves, with convergent veins ; perianth in two 

 whorls, of three leaves each (calyx and corolla). Butomus, 

 Limno charts. (Pf. II, i, 232.) 



Family 3. Triuridaceae. Very small, pale, leafless plants 

 growing in wet places in tropical countries. Trinris. (Pf. II, 

 I, 235.) 



Family 4. Scheuchzeriaceae. Aquatic or paludose herbs with 

 rush-like leaves, and small flowers, with a two-whorled perianth, 

 each 4 to 6 parted. Triglochiii, Schcuchzcria. (Pf. II, i, 222.) 



Family 5. Aponogetonaceae. Aquatic plants with petioled, ob- 

 long, translucent leaves, with convergent veins ; flowers small, 

 spicate. Aponogcton. (Pf. II, i, 218.) 



Family 6. Naiadaceae. Slender, branching wholly submerged 

 aquatics, with sheathing, mostly opposite leaves, and monoecious 

 or dioecious flowers. A^aias. (Pf. II, i, 214.) 



Family 7. Potamogetonaceae. Aquatic or paludose herbs with 

 mostly alternate stem-leaves ; flowers mostly small and incon- 

 spicuous ; perianth none, or of i to 6 leaves in i or 2 whorls. 

 Potamogeton, Zostcra, Zannichellia. (Pf. II, i, 194.) 



Order Liliales. . Pistils united (usually 3), forming a com- 

 pound pistil, superior; flower leaves (usually 6, in two whorls) 

 delicate and corolla-like. 



Family 8. Liliaceae. Pistil mostly 3-celled ; stamens 6 ; peri- 

 anth of two similar whorls, each of three similar leaves. Lilium, 

 Ey\'throvAuin, TuUpa, Yucca, Asparagus, Allivm. (Pf. II, 5, 

 10.") 



Family 9. Stemonaceae. Pistil i-celled; stamens 4; perianth 

 of two similar whorls, each of two similar leaves. Stonona, 

 Croomia. (Pf. II, 5, 8.) 



Family 10. Pontederiaceae. Aquatic herbs with 3- or i -celled 

 pistil ; stamens 6 or 3 ; perianth of two similar whorls, each of 

 three similar or dissimilar leaves. Pontcderia, Hctcranthera. 

 (Pf. II, 4, 70.) 



327 



