LILIACEAE (lily FAMILY) 281 



Tribe IX. YUCCEAE. Flowers perfect, racemo-paniculate. Perianth cam pan uiaie ; its segments 

 (large) distinct or somewhat connate near the base. Fleshy 3-lobed stigmatophore nearly or 

 quite sessile. Fruit a loculicidal capsule. Cells many-seeded. 



21. Yucca. Leaves sword-shaped, rigid. 



Tribe X. POLYGONATEAE. Flowers perfect. Style single, entire or shortly 3-cleft at the 

 summit. Fruit a berry. 



* Proper leaves reduced to scarious scales, the apparent (phyllodial) leaves filiform. 



22. Asparagus. Stem excessively branched. Flowers small, axillary. 



* * Leaves neither scale-like nor Mform. 

 ■I- Perianth-segments distinct. 



23. Clintonia. Scapose. Flowers umbellate or subumbellate. 



24. Smilacina. Leafy-stemmed. Flowers 6-parted, racemose or paniculate. 



25. Maianthemum. Low ; stem 1-3-leaved. Flowers 4-parted. 



26. Disporum. Leafy-stemmed. Flowers few in terminal umbels. 



27. Streptopus. Leafy-stemmed. Flowers axillary on bent pedicels. 



+- -i- Perianth-segments connate. 



28. Polygonatum. Stem leafy. Peduncles axillary, 1-S-flowered. Perianth cylindrical. 



29. Convallaria. Leaves sheathing the scape. Flowers racemose. Perianth bell-shaped. 



Tribe XI. PARIDEAE. Flowers perfect. Perianth-segments distinct. Style-branches distinct. 

 Fruit a berry. Cauline leaves whorled. 



30. Medeola. Cauline leaves in 3 whorls. Flowers umbellate. Styles filiform. 



31. Trillium. Cauline leaves 3 in a single whorl. Styles short, thick, the stigmatic surface 



irregular. 



Tribe XII. ALETREAE. Flowers perfect. Perianth (small, white or yellow) gamophyUous, 

 conspicuously roughened. Style single, slightly cleft at the summit. Ovary partly inferior. 

 Fruit a loculicidal many-seeded capsule. 



32. Aletris. Scapose. Flowers in a spicate raceme. 



Tribe XIII. SMILAcEAE. Flowers dioecious, umbellate. Fruit baccate. Leaves net-veined. 

 Tendrils usually present. 



33. Smilax. Periant:i-segments distinct, deciduous, small, greenish or yellowish. 



Artificial Key to Genera 



a. Flowers dioecious. 



Inflorescence umbellate ; fruit a berry 33. Smilax. 



Inflorescence a spicate raceme ; fruit a pod 4. Chamaelibidt*. 



a. Flowers perfect or monoecious b. 



b. Perianth gamophyllous, urceolate or campanulate, with a shortly 

 toothed Mmb. ' 



Stem leafy ; leaves ovate, oblong, or lanceolate 28. PoLTGO>'ATrM. 



Stem scapoid, leafy only at the base. 

 Leaves oblong ; perianth white. .... 



Leaves very narrow, lanceolate to linear or terete. 



Perianth smooth, blue 



Perianth roughened, white or yellow 

 b. Perianth cleft at least to the middle or divided to the base c 

 c. Fruit a berry d. 

 d. Cauline leaves whorled. 



Cauline leaves 8. in a single involucre-like whorl . 



Cauline leaves in 2 whorls 



d. Cauline leaves alternate or none. 



Leaves all basal 



Leafy-stemmed. 

 Real leaves scale-like ; apparent leaves filiform . 

 Leaves foliaceous. never filiform. 



Flowers 4-parted , 



Flowers 6-parted. 

 Flowers racemose or paniculate . 



Flowers inubellate 



Flowers axillary, solitary or in pairs 

 5. Fruit a capsule e. 



e. Style none or very short and fleshy. (See als.i 'I'nJ ipa. 

 Flowers siiiail ; leaves di.^tichous .... 

 Flowers large ; leaves several-inany-ranked . 



29. Convallaria. 



20. MrscART. 

 32. Aletris. 



31. Trillium. 

 30. Medeola. 



23. Clintonia. 



22. Asparagus. 



2.'). Maianthemum. 



. 24. Smilaclna. 



. 20. DlSHORUM. 



. 27. Streptopus. 



p. •>;.) 



1. Xartheciim. 



. 21. YiccA. 



