414 CAXXABIXACEJE. (HEMP FAMILY.) 



2. P. debilis, Forst. Pubescent with straight and hooked hairs inter- 

 mixed ; stem much branched, pellucid ; leaves ovate, mostly acuminate, but 

 obtuse, roughened with elevated dots ; clusters loose, spreading ; flowers as 

 long as the involucre. (P. Floridana, Nutt.) Damp shaded sandy soil near 

 the coast, Florida to North Carolina. June -Aug. () Stem |- l long 

 Leaves 6" - 9" long, about the length of the slender petiole. 



5. BCEHMERIA, Jacq. FALSE-NETTLE. 



Flowers monoecious or dioecious, in spiked clusters. Calyx of the sterile 

 flowers 4 - 5-cleft. Stamens 4-5. Calyx of the fertile flowers tubular, 4 - 5- 

 toothed or entire. Stigma subulate, hairy. Achenium elliptical, enclosed in 



the persistent calyx. Hough herbs with alternate or opposite petioled leaves. 



^ 



1. B. cylindrica, Willd. Pubescent and rough with straight and hooked 

 hairs ; leaves opposite and alternate, ovate and ovate-lanceolate, acuminate, ser- 

 rate, rounded and 3-nerved at the base, on long or short petioles ; spikes axil- 

 lary, mostly leafy at the summit, the fertile ones compactly flowered, short ; the 

 sterile interrupted, and sometimes longer than the leaves. (B. lateriflora, Muld.) 

 Swampy thickets, Florida, and northward. July -Sept. 1J. Stem l-3 

 high, mostly simple. Leaves 2' -5' long. 



ORDER 123. CANIVABINACE^E. (HEMP FAMILY.) 



Erect or twining herbs, with opposite incised or lobed and stipulate 

 leaves, and dioecious flowers. Sterile flowers racemose or panicled. Ca- 

 lyx 5-sepalous. Stamens 5, opposite the sepals, not inflexed in the bud. 

 Fertile flowers in bracted spikes. Calyx 1-leaved, embracing the 1-celled 

 ovary. Ovule solitary, erect. Stigmas 2, subulate, pubescent. Fruit in- 

 dehiscent. Albumen none. Embryo coiled or curved. 



1. HUMULUS, L. HOP. 



Sterile flowers panicled. Fertile flowers in short axillary and solitary spikes. 

 Bracts leafy, imbricated, 2-flowered, forming in fruit a membranaceous cone. 

 Calyx enlarged in fruit. Embryo spirally coiled. A rough perennial twining 

 herb, with cordate 3 - 5-lobed leaves, and greenish-yellow flowers. 



1. H. Lupulus, L. Low grounds along the mountains, Georgia, and 

 northward. June and July. Stem 6 -10 high. Leaves petioled, serrate. 

 Achenium covered with resinous yellowish odorous grains. 



ORDER 124. MORACE.E. (MULBERRY FAMILY.) 



Trees or shrubs, with milky juice, alternate leaves, with large decidu- 

 is stipules, and monoecious or dioecious flowers, crowded in spikes or 



