190 MONOECIA POLYANDRIA. [CI. 21. 



MONOECIA PENTANDRIA. 



433. XANTHIUM. Bur- weed. 



1. X. strumdrium, 36. 2544. (Broad-leaved B.) Prickles none. 

 Leaves heart-shaped ; three-ribbed at the base. 

 Rich soil, or dunghills, rare; not wild. 0. 8, 9. Stem solit., branched, 

 2f. Fl. green. 



434. AMARiNTHUS. Amaranth. 



1. A. Bliturn, 31. 2212. (Wild A.) Flowers three-cleft, with three 

 stamens, in small lateral tufts. Leaves ovate. Stems spreading. 

 Rich gr. and dunghills, rare. 0.8. L. entire. Fl. green. Seed black 

 and shining. 



435. BRYONIA. Bryony. 



1. B. dioica, 7. 439. (Red-berried B.) Leaves palmate, rough on 

 both sides with callous points. Flowers dioecious. 

 Hedges. 1£. 5 — 9. Rough, leafy, climbing by tendrils. Fl. white. 

 Berr. scarlet. 



MONOECIA HEXANDRIA. 



436. ERIOCiULON. Pipewort. 



1. E. septanguldre, 11. 733. (Jointed P.) Florets four-cleft. Capsule 

 of two cells. Stem with about seven angles, many times taller 

 than the channelled, taper-pointed leaves. Flower convex. 

 Outer calyx-scales empty, rounded, smooth. 

 Lakes in the Hebrides and South W. of Irel. %. 6. Stalk If. 

 naked. Fl. white, feathery. 



MONOECIA POLYANDRIA. 



437. CERATOPHyLLUM. Hornwort. 



1. C. demersum, 14. 947. (Common H.) Fruit armed with three 



spines. Segments of the calyx notched at the extremity. 

 Ditches. If. . 8. 9. Floating, whorled, dichotomous. 



2. C. submersum, 10. 6/9. (Unarmed H.) Fruit destitute of spines. 



Segments of the calyx acute, entire. 

 Ditches, rare. If.. 9. L. more compound. Scarcely a distinct sp, 



438. MYRIOPHYLLUM. Water- Milfoil. 



1. M. spicdtum,2. 83. (Spiked W.) Flowers in whorled, interrupted, 

 leafless spikes. 



