Monocotyls or Endogenous Plaiits. 19 



2. Genus AR-I-SAE'-MA. — Spatlie mostly arched above; leaves 

 divided; scape simple, from a ver}- pungent tuberous root-stock or 

 corm. 



Ar-i-sae'-ma tri-phyr-lum (L.) Torr. Indian Turnip. — Leaves mostly 2, •^V/J 

 leaflets 3; spadix club-shaped, obtuse, shorter than the spathe. 



Ar-i-sae'-ma dra-con'-ti-um (L.) Schott. Green Dragon; Dragon-root; 

 Indian Turnip. — Leaf usually solitary, pedately divided into 7-11 leaflets; 

 spadix tapering to a long and slender point. 



III. Order COM ME-LI-NA'-CE-ZE. SPIDERWORT FAMILY. - Stems 



jointed, leafy ; sepals :!, persistent ; petals .3, ephemeral ; stamens 6; 

 ovary 2-.'3-celled, superior. 



1. Genus TRA-DES-CAN'-TI-A. — Sepals 3, persistent, herbaceous, 

 petals 3, ephemeral; stems mucilaginous, leafy, the leaves keeled. 



Tra-des-oan'-ti-a vir-gin-i-a'-na L. Common Spiderwort. — Plant more 

 or less glaucous; leaves linear. 



Tra-des-can'-ti-a pi-lo'-sa Lelim. {T. virginica var. flexuosa Wats.) 

 Hairy Spiderwort. — Stout and dark green ; leaves large, linear-lanceolate, 

 pubescent. 



IV. Order LIL-I-A'-CE-/E. LILY FAMILY. — Flowers perfect, regu- 

 lar, stamens (i, opposite the segments; ovary 3-celled, superior. 



Flowers in spikes, racemes, corymbs or panicles (a). 



Flowers in umbels (e). 



Flowers solitary (c). 



Flowers terminal, few or many, not as above 'd). 



Flowers axillary i . 

 a. Plants with radical leaves, flowers on scapes g . 

 a. Plants with leafy stems b . 



b. Flowers perfect, very large, segments recur\'ed or spreading f). 



b. Flowers perfect, small, white, not spike-like k \ 



b. Flowers dicecious, small, white, in a spike-like raceme. . . ChaiiitTlirium. 1 



c. Leaves oblong, alternate, sessile-clasping or perfoliate Uvulatia. 2 



c. Leaves three in a whorl at the summit of the stem 'ni. 

 c. Leaves in 2 whorls, ;i-9 in each whorl ni . 

 c. Leaves 2, elliptic-lanceolate, shining, mostly mottled (f ;. 

 c. Leaves ovate, closely sessile, plants downy 1). 



d. Leaves oblong, alternate, sessile-claspwig or perfoliate (c, above). 



d. Leaves ovate, closely sessile, plants downy Ij. 



d. Leaves in 2 whorls of 3-9 each (mj. 

 e. Perianth 6-parted, odor alliaceous Allium. 3 



f. Stem scapel with a pair of mottled leaves, flower nodding. ^ry/^/owz^w. 4 



