7,6 Charles E. Bessey 



or 2 whorls. Potamogeton, Zostera, Zannichellia. (Pf. II, i, 

 194- ) 



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

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

 whorls) delicate and corolla-like. 



Family 10. Liliaceae. The Lilies. Pistil mostly 3-celled; sta- 

 mens 6; perianth of two similar whorls, each of three similar 

 leaves. Liliiim, Erythroninm, Ttdipa, Yucca, Asparagus, Allium. 

 (Pf. II, 5, 10.) 



Family 11. Stemonaceae. Pistil i-celled; stamens 4; perianth 

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

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



Family 12. 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. Pontedcria, Hetcranthera. 

 (Pf. II, 4, 70.) 



Family 13. Cyanastraceae. Tropical African rhizomatous 

 plants. Cyanastrum. (Syllabus, 96.) 



Family 14. Philydraceae. Pistil 3-celled ; stamen i ; perianth 

 of two similar whorls, each of two dissimilar leaves. Philvdrium. 

 (Pf- II, 4, 75-) 



Family 15. Commelinaceae. Spider worts. Succulent herbs 

 with 3- or 2-celled pistil; stamens 6; perianth of two dissimilar 

 whorls of three similar leaves. Commelina, Tradescantia. (Pf. 

 II, 4, 60.) 



Family 16. Xyridaceae. Rush-like plants with a i-celled or 

 incompletely 3-celled pistil ; stamens 3 ; perianth of two dissimilar 

 whorls, each of three similar leaves. Xyris. (Pf. 11, 4, 14.) 



Family 17. Mayaceae. Slender, creeping, moss-like plants 

 with I-celled pistil; stamens 3; perianth of two dissimilar whorls, 

 each of three similar leaves. Mayaca. (Pf. II, 4, 16.) 



Family 18. Juncaceae. Rushes. Herbs with narrow leaves; 

 pistil I- to 3-celled;, ovules solitary or many; fruit a dry 3-valved 

 pod. Juncus, Luzula. (Pf. II, 5, i.) 



72 



