niOECIA. PENTA.ND11IA. 2S7 



Leaves opposite entire; flowers paniculate, axillary and 

 terminal. 



Species. 1. I. celosioides. — A genus of about 6 species 

 indigenous to the warmer parts of America. 



791. ACNIDA. i. 



Masc. Calix 5-parte(l. Corolla none. Fem. 

 Calix S -parted. Corolla none. S^les none. 

 Stigmas 3, sessile. Capsule 1 -seeded. 



Annual, subaquatic plants with the aspect of .imciran- 

 thns, scarcely distinct from Spiiiacia. Stems grooved, 

 leaves lanceolate, entire; flowers glomerate, axillary, sub- 

 rrxemose; stigmas sometimes 4 or 5, the fruit then 4 or 5- 

 angled. 



Species. 1. A. cannabina. 2- rusocarpa. — A North 

 American genus indigenous to river marshes from Canada 

 to Florida. 



792. HUMULUS. Z. (Hop.) 



Masc. Calix 5 -leaved. Corolla none. Fem. 

 Calix 1-leaved, obliquely spreadiri,^, entire. 

 Corolla none. Styles 2. Seed 1, within the leafy 

 calix, (or strobilus.) 



An herbaceous twining and asperate plant; leaves oppo- 

 site, trifid; stipules connate below; male flowers alternate 

 and loosely paniculate, axillary and terminal; female ones 

 verticillate and sessile, densely spiked, spikes or heads 

 pedunculate, axillary and terminal, paniculate, divisions 

 of the panicle stipulate. 



Species. H. Lupulus. v.v. Abundant on the banks of 

 the Missislppi and Missouri. 



Order VI.—HEXANDRIA. 



r93. SIMILAX. L. (Green Brier, Sarsaparilla.) 



Masc. Calix 6-leaved. Corolla none. Anthers 



adnate to tho filaments. Fem. Flower similar 



to tlic male. Style minute. Stigmas 3. Berry 3- 



celled, superior; 1, 2, or 3-si'eded. 



Stents scandent, sufTruticose or herbaceous; leaves aJ- 



