676 



Obdeb lM.—AIABiiACBJZ. 



CoHOET 6, FLORIDE^. 



Endogenous plants with the Flowers usually perfect and 

 complete, the perianth double, 3-parted, the outer often, and 

 sometimes both, green. 



Obdee CXXXV. ALISMACEJi Water Plantains. 



Marsh herbs, with parallel- veined, petiolate leaves and branching peduncles- 

 FUnoers perfect or inoacecioua, with a regular doublo perianth. Sepals 3, greon ; 

 petals 3, colored or green ; siamens hypogynous. Ovaries 3 or mqre, separating 

 into as many 1 -seeded achenia. 



Genera 9, species 70, diatribated in all parts of tbe world, more common in temperate 

 •rllmates. One species of Sagittaria is oaltivated for foo<l in China (S. Sinonais). (Our spooinwBB 

 irero lovlsed by Dr. Kngolman.) 



SUBOKDERS AND GBNKllA. 



I. ALISME^. Petals white, with a green calyx. 

 Embryo carved. Leaves rush-like, with no 

 lamina, (a) (Stam6. Alisma. 1. 



a Fls. ail perfect. 1 Stam. 9.-94. KcniN. 2. 

 a Fls. diclinona. Stam. 00 . . .fiAOiTTAKiA. .S 



II. JUNCAGINE.^. Petal8greenl8h,Uket!iesopnls. 

 Embryo straight. Leaves mostly expanded 

 to a lamina, (b) 



b Anthers oval. Lvp. radical. ..TftlQLOCiiiN. 4 

 b Anth. linear. Lvs. cauline.ScuEircnzEUlA. h 



FIG. 712. Inflorescence of a Sagittaria, It i,r 

 and flowers. «, One of the pistils enlarged, t, The pis- 

 til of Alisma cut open, showing the seed and curved en.- 

 bryo. 



1. ALIS'MA, L. Water Plantain. 

 (Celtic alis, water 1) Flowers 5 ; sepals 

 3, persistent ; petals 3, ajstivation involute ; stamens C ; ovaries and 

 styles numerous, arranged in a circle, forming as many flattened ach- 

 enia. — 2i Acaulescent, marsh herbs, with mostly expanded leaves, and 

 *ith panicled flowers. 



A. plant^go L. Lvs. all radical, ovate or oval, subcordate, abruptly acuminate ; 

 scape many-flowered; fls. verticillato in the panicle; carpels 15 to 20, ribbed on 

 the back, forming an obtusely triangular whorl. — A common, smooth, handsome 

 inhabitant of pools and ditches. Lvs. resembling those of the common plantain, 

 with about 5 veins running from end to end, connected by cross veinlets. Peti- 

 oles 8 — 12' long. Panicle a scape, 1 — 2f high, with numerous, small, roso-white 

 flowerii. Jl., Aug. (A. trivialis and parviflora Ph.) 



2. ECHINODO'RUS, Richard, Engelm. (Gr. (I^tvof, the sea-urchin, 

 (Sopdf , a sack ; alluding to the head of carpels bristly with the persistent 

 styles.) — Flowers ^\ sepals 3, persistent; petals 3, sestivation imbri- 

 cate ; stam. 6 — oo; ovaries and styles oo, imbricated in a head, form- 

 ing as many flattened, beaked achenia. — Scape creeping or erect, flow- 

 ers verticillate. 

 1 E. radicana Engelm. Leaves ample, ovato, obtuse, cordate, about 7-Teiaed, oo 



long petioles ; scape prostrate, rwming and rooting at the proliferous joints ; fls. 



