April, 1913.] Liliales of Ohio. 109 



LILIALES OF OHIO. 



Blanche McAvoy. 



In this study it has been my aim to arrange the species belong- 

 ing to the Liliales of Ohio in a phyletic series and to make such 

 keys as are needed for the easy identification of those species 

 known to accur within the limits of the state. The distribution 

 given is based on specimens in the state herbarium at the Ohio 

 State University. It is known that this distribution is not com- 

 plete, but it was thought best to confine the list to specimens 

 at hand in order that it may be readily verified and that botanists 

 of the state may be able to see what is needed to make the herba- 

 rium more complete. 



LILIIFLORAE. 



Herbs, sometimes shrubs, lianas or trees, usually with prom- 

 inent flowers, having showy petals or staminodes; flowers hypogy- 

 nous or epigynous, solitary or clustered, pentacyclic, trimerous, 

 usually bisporangiate, actinomorphic in the lower forms, but 

 zygomorphic in the higher; carpels 3 or rarely 2, united. 



LILIALES. 



Herbs, shrubs, lianas or trees, usually with showy flowers; 

 flowers hypogynous, usually pentacyclic, mostly actinomorphic; 

 bisporangiate, monecious or diecious; endosperm mealv, horny 

 or fleshy. 



Key to the Families. 



1. Perianth not chaff-like and the flowers not in dense scaly heads; at 



least the inner whorl of the perianth petal-like; perianth segments 

 sometimes united. 2. 

 1." Perianth glumaceous; or partly glumaceous with the flowers in dense 

 scaly heads or spikes. 5. 



2. Flowers usually bisporangiate; if monosporangeate then not with ten- 



drils and flowers not in umbels. 3. 



2. Flowers monosporangiate, umbellate; plants usually with tendrils, 



often woody. Smilacea. 



3. Perianth of similar, mostly colored, persistent segments are of 3 green 



sepals and 3 colored, withering persistent petals; (rarely a 4-parted 

 perianth). LiliacecB. 



3. Perianth ephemeral, with 3 colored, deliquescent petals or a six-parted 



tubular, ephemeral perianth. 4. 



4. Perianth tubular, six-parted; aquatic herbs. Pontederiacece. 



4. Perianth usually of 3 green sepals and 3 colored, deliquescent petals; 



terrestrial herbs. CommelinacecB. 



5. Inflorescence paniculate or capitate, always with leaf-like bracts at 



the base; perianth of similar segments. Juncacece. 



5. Inflorescence in dense heads or spikes, without leaf-like bracts at^the 



base. 6. 



6. Ovulary unilocular; flowers bisporangiate. Xyridacece. 



6. Ovulary 2-3-locular; flowers monosporangiate. EriocaulacecB. 



