PONTEDERIACE.E, XYKIDACE.E, ERIOCAULONACE^. 21:7 



Order CVII. PONTEDERIA'CEiE. (ProKEREL-wEED F.) 

 The most common representatives of this Order with us 

 are 



1. I>U\TEDf;ria, L, Pickerel-weed. 

 P. eorda'ta, L. A stout plant growing in shallow water, 

 sending up a scape bearing a single large arrow-heart-shaped 

 blunt leaf, and a spike of violet-blue flowers with a spathe-like 

 hract. Perianth 2-lipped, the 3 upper divisions united, the 3 

 lower spreading, the whole revolute-ooiled after flowering, 

 the fleshy base enclosing the fruit. Stamens 6, 3 of them 

 exserted on long filaments, the rest short. 



Var. angUStifolia, Torr., has narrow scarcely cordate 

 leaves. 



8. SCHOL'LERA, Schreber. Water Star-grass. 



S. gramin'ea, Willd. {Heter anther a graminea, Vahl.,in 

 Macoun's Catalogue.) A grass-like herb, wholly under 

 water, only the small yellowish flowers reaching the surface, 

 the latter single, from spathes. Perianth salver-shaped, 

 regular. Stamens 3, anthers sagittate. 



Order CVIII. XYRIDA'CE.ffl. (Yellow-eyed-orass F.) 

 Eush-like herbs, with equitant leaves sheathing the base 

 of a naked scape, terminated by a head of perfect 3-androus 

 flowers, with glumaceous calyx and coloured corolla. Cap- 

 sule 3-valved and l-celled, containing several or many seeds. 

 XYRIS, Gronov. Tellow-eyed Grass. 

 X. flexuo'sa, Muhl., var. pusiU'a, Gray. Scape small 

 and very slender, 2-9 inches high, not bulbous at the base. 

 Flowers in the axils of scale-like bracts densely imbricated 

 in a head. Sepals 3. Petals 3. Fertile stamens 3, with 3 

 alternating sterile filaments bearded at the apex. — Peat bogs 

 and wet sandy shores, Atl. Prov. and northward. 



Order CIX. ERIOCAULONA'CE^. (Pipewort F.) 

 Represented with us by the genus 



ERIOCAII'I.ON, L. Pipewort. 

 E. septangula're, Withering. A slender plant with a 



