empetracejb. '213 



Obdbb XCI EMPETRA'CEiE. (Cbowberry T'amtt.t). 



Low shrubby evergreens, resembling heaths as to leaves 

 and general aspect. Flowers diteoious or polygamous 

 Calyx somewhat petal-like or none. Ovary 3-9-oelled, 

 berry-like in fruit. 



Synopsis uf the Genera. 



1. Em'petrum. Flowers scattered and solitary In the axils. Sepals 3, 



somewhat petal-like. 



2. Tore ina. Flowers In terminal heads. Calyx none. 



1. ElU'PETRIISI, Tom-n. Ceowbebhy. 

 E. ni'gFUm, L. (Black Groweerry.) A slender procum- 

 bent shrub with the foliage and aspect of a heath. Flowers 

 polygamous, inconspicuous in the axils of the leaves. Calyx 

 3 petal-like sepals. Corolla wanting. Stamens 3. Fruit a 

 blackberry-like drupe. — Atl. Prov. and northward. 



2. CORE'AIA, Don. Beoom-Ceowbebry. 

 C. Conrad' ii, Torr. (Bboom-Crowberry.) Olosely resem- 

 bling the preceding. Flowers dioecious or polygamous, col- 

 lected in terminal heads, each in the axil of a scaly bract, 

 having no true calyx, but with 5 or 6 thin, dry bractlets 

 under each. Stamens 3 or 4 with slender filaments. Drupes 

 small, juioeless when ripe. — Atl. Prov. 



Ordbb XCn. CERATOPHYLLA'CE.a;. (Hornwort F.) 

 Represented, with us, by a single species. 



CERATOPinri.'Li;M, L. Hoenwoet. 

 C. demer'SUm, L. An aquatic herb, with whorled finely 

 dissected leaves, and minute axillary sessile monoecious 

 flowers, without calyx or corolla, but with an 8-12-oleft 

 involucre. Staminate flowers of 12-24 stamens with large 

 sessile anthers. Pistillate flowers of a single 1-celled ovary, 

 forming an achene, beaked with the slender style. Embryo 

 with 4 cotyledons. — Under water in ponds and slow streams. 



