306 



THE FLORA. 



1 S. herba'cea. Carrion-flower. Stem herbaceous, erect or reclined, without pricklea. 



Lvs. ovate-oblong, 7-veined. Flower* 8-50 on each long peduncle, ill-scented. 



2 S. rotundifo'lia. Common Oreenbrier. Vine green, strong and tliorny, somewhat 4-an- 



gletl. Leaves round-ovate, 5-7-veined, cusp-pointed. Peduncles a little longer (6-7"] 

 than the petioles. Berries bluish-black. Thickets. 1U-30T. 



} S. hispida. Vine terete, bisjrid with weak prickles if any. Lvs. thin, ovate, cuspidate 

 Peduncle twice as long (I') as the petioles. Berries black. Thickets 1 . 



ORDER CXXXVII. ALISMACEJG. Alismads. 



Herbs growing in water, with the leaves parallel-veined, and with the 

 flowers regular and not on a spadix ; the perianth consisting of 

 sepals and petals, 3 of each, the former always green ; 

 ovaries free, 3 or more, separating into as many 1 -seeded achenia. 



Analysis of the Genera. 



Both the calyx and corolla greenish. Lvs. 



rnsh-like (Arrow-grasses) b 



Corolla colored, white. Leaves mostly 



with a lamina. . . .a 

 a Fls. 9 . Sta. 6. Carpels whorled. 



Water Plantain. ALISMA. 1 

 a Fls. 5 . Stamens 9-24. Carpels in a 



head. Echinodore. ECHINODORUS. 

 a Fls. Sta. many. Carpels in a 



head. Arrow-head. SAOITTARIA. 2 

 b Lva. radical. Anthers ovate. Carpels 



1 seeded. Trigloch. TRIGLOCHIN. 

 b Leaves cauline. Anthers linear. C.ir- 

 pels 1-2-seeded. SCHEUOHZERIA. 



1. ALISMA. "Water Plantain. 



Flowers perfect. Stamens 6. Ova- 

 ries and styles numerous, collected into 

 a whorl, becoming in fruit many dis- 

 tinct, flattened achenia. U Stemless 

 herbs, the leaves all radical. Flowers 

 in a panicle. 



A. planta'go. A common, smooth, handsome 

 inhabitant of ponds and ditches. Leaves 

 oval or ovate, abruptly acuminate, 7-9- 



Fig. 643. Sajrittaria sagittifolia (com- 

 mon form), leaf and flowers. 4. One 

 of the pistils enlarged. 5. The pistil ol 

 Altsma cut open, showing the seed and 

 <urved embryo. 



