36 XVRIDACEAE. 



1. PELTANDRA Raf. Tufte.l herbs with rootstocks. Leaf-blades of a 

 hastate or sagittate type. Scapes recurved at maturity. Flowers monoecious. 

 Spadix completely covered with flowers. Stamens 6-10. Spathe green or 

 white. Fruits green or red. 



1. P. vlrginica (L.) Kunth. Leaf-blades sagittate or hastate, with several 

 prominent lateral ribs: spathes 8-20 cm. long, the edges crisped: spadix 

 included, i pistillate, J staminate: fruits mostly over 1 cm. thick. Everglades. 

 ARROW- ARUM. 



Order XYREDALES. 



Terrestrial, commonly bog, herbs, or epiphytes in BROMELIACEAE. 

 Leaves often basal : blades prevailingly narrow. Inflorescence usually not 

 a spadix, but often with a spathe-like bract or a spathe. Flowers mostly 

 complete. Corolla regular or nearly so (except in some genera of COM- 

 MKLIXACKAE. PoxTEDERiACEAE and BROMELIACEAE). Gynoecium compound, 

 superior or rarely inferior. Fruit a capsule or utricle, or baccate. 



Ovary 1-cellod, with parietal placentae: Inflorescence withont a spathe. 



Fam. 1. XYBIDACKAB. 

 Ovary 2-3-celled. If Incompletely so or If nearly 1 -celled 



then the flowers In a spathe. 

 Flowers minute, monoecious or dioecious. In dense 



heads each seated in an Imbricated Involucre. Fam. 2. EHIOCAPLACEAE. 



Mowri conspicuous or relatively so. perfect. 



Terrestrial or aquatic plants : foliage not scurfy : 



stigmas united. 



Calyx and corolla free, of very different mem- 

 bers : stamens frep. Fam. 3. COMMEMXACBAB. 

 Calyx and corolla of quite similar members and 

 partially united : stamens partially adnate 



to the perianth. Fam. 4. PONTEDERIACEAE. 



Epiphytes (our species), with scurfy foliage: 

 stigmas 3. Fam. 5. BBOMBUACBAB. 



FAMILY 1. XYRIDACEAE. VH.I.<I\V-EYED GRASS FAMII.V 



Leaves basal: blades thickish. Flowers perfect, in a compact tormina! 

 spike. Sepals 3, the two lateral ones firm, keeled and often appendaged, 

 persistent, the third larger, deciduous. Petals 3, fugacious: anthers 

 linear. Androecium of 3 stamens usually alternating with 3 staminodia. 

 Gynoecium 3-carpellary. Fruit a capsule. 



1. XYBI8 [Gronov.] L. Rigid plants with basal equitant leaves and a 

 terminal spike with indurated bracts. YELLOW-EYED GRASS. 



Lateral sepals Included. 



Rplkes ovoid, oval or globular: bracts In several series. 1. X.communt* 



Spikes oblong to conic-oblong; bracts In many series. 2. X.rlntu. 



Lateral sepals exserted. 



Corolla yellow : upper part of the scape and the spike green. .'?. .V. arrni 



Corolla white : upper part of the scape and the spike glaucous. 4. X. poUetoow. 



1. Z. communlfl Kunth. Leaves gradually attenuate, shorter than the scapes: 

 scapes 2-7 dm. tall, 2 edged above: spikes oval or globular, *-!."> mm. long: 

 bracts closely imbricate in few series: lateral sepals 3-4 mm. long; wing nar- 

 rower than the sepal-body, erase- or incised-toothed above the middle. 

 Pinelands. (Cii&a, Ant.) 



2. JL eUta Chapm. Leaves few, 2-6 dm. long: scapes 3-12 dm. tall, 2 edged 

 above: spikes oblong to conic-oblong, 16-23 mm. long: bracts numerous, 

 closely imbricate in many series: lateral sepals 4-5 mm. long; wing narrow, 

 toothed above the mi. I. lie. Low pinelands. 



