Order 115.— URTICACKjE. 637 



samo axiL Rare northward, frequent South. Feb., Mar. (South). Apr. — Jn. 

 (North). § Eur. 



4 U. purpurascens Nutt Assurgent, beset with spreading stings ; lvs. broadly 

 ovate, cordate, 3-veined, coarsely crenate-serrato ; glomeruli capitate, much shorter 

 than the petioles, dense, axillary, spicate at top. — Ky. to La. Sts. purplish, 12 

 to 18' high, clustered. Lvs. variegated, 1' long and wide, petiole G to 9". Mar. 

 —May. 



5 TJ. chamasdroides Ph. St. bristly with sting's ; lvs. subsessile, ovate, serrate, 

 strigous beneath ; glomerules axillary, sessile, subglobowt, reflexed. — On the islands 

 of Ga. (Pursh.) Lvs. small. Stings white and very conspicuous. May. — Is thia 

 a variety of U. urens ? 



2. LAPORTEA, Gaudich. Wood Nettle. Flowers 8 or $ $ ; $ 

 calyx 5-partcd ; stamens 5; ovary rudimentary,- hemispherical; $ calyx 

 4-sepaled, the 2 outer minute, the 2 inner foliaceous in fruit ; stigma 

 subulate, elongated ; achenia compressed-lenticular, very oblique, finally 

 reflexed on the winged pedicel. — 2f. Hairs stinging. Lvs. ample, alter- 

 nate ovate. Fls. in axillary panicles, the lower sterile, upper fertile. 

 L. Canadensis Gaud. Hispid and stinging ; lvs. on long petioles, broad-ovate, 



rounded or subcordato at base, serrate, acuminate ; panicles axillary, solitary or 

 in pairs, divaricate, mostly shorter than the petioles, the fertile nearly terminal, 

 elongated in fruit. — Damp woods, U. S. and Can. St. 2 to Gf high, mostly simple, 

 flexuous at top. Lvs. 3 to 5' by 2 to 3', more or less hispid both sides, sometimes* 

 nearly smooth. Lower petioles 3' long. Fls. minute, in panicles 1 to 4' in length, 

 the fertile panicle about 2', erect, enlarged in fruit. Aug. (Urtica Canadensis 

 and divaricata L.) 



3. PI V LEA, Lindlcy. Rich-weed. (Lat. piteus, a cap ; from the 

 resemblance of one of the sepals of P. muscosa.) Flowers 8 or £ ?. 



S Calyx of 3 or 4 equal sepals ; stamens 3 or 4. $ Calyx of 3 oblong, 

 unequal sepals ; stamens rudiments 3, cucullate opposite the sepals ; 

 achenium roughened, opaque, ovate, erect, nearly naked. — (J) Smooth, 

 stingless, with opposite lvs., united stipules and dense, axillary clusters, 

 both kinds mixed. 



P. pumila Gr. Ascending, weak, succulent ; lvs. on long petioles, rhombic- 

 ovate, crenate-serrate, membranous and glabrous, 3-veined ; fls. in short clusters ; 

 $ sepals slightly unequal. — (D In waste places, about buildings and in woods, U. 

 S. and Can. St. fleshy, semi-transparent when growing in shades, smooth and 

 shining, 3 to 18' long, simple or branched. Lvs. pale green, 1 to 2' by 8 to 16", 

 petioles of about the samo length. Sep. much shorter than the greenish, mottled 

 achenium, one of them a little longer than the other two. Jl. — Sept (Urtica, 

 L. Ad ice, Raf.) 



4. 8(EHffiE v RIA, Jacq. False Nettle. (Named for G. F. Bcehmer, 



z German botanist.) Flowers g or ,3 ? . $ Calyx 4-partcd, with lan- 

 ceolate, acute segments ; stamens 4 ; $ calyx tubular, truncate or 4- 

 toothed, persistent and closely investing the ovate, pointed achenium. 

 — Herbs or shrubs, stingless. Lvs. opposite or alternate. Fls. clus- 

 tered. 



1 B. cylindrica Willd. Herbaceous, dioecious, smootMsh ; lvs. opposite, ovate, 

 acuminate, dentate, on long petioles ; sterile spikes interrupted, fertile cylindric. — 

 A coarse, nettle-like plant, in swamps and bottoms, Mid. and W. States. St 

 slender, obtusely 4-angled, channeled on each side, 2 to 3f high. Lvs. 3-veined, 

 3 to 5' long, half as wide, petioles 2 to 3', the upper sometimes not quite opposite. 

 Fls. minute, the fertilo spikes 1 to 2' in length, tho barren spikes longer and more 

 slender. JL, Aug. (Urtica eapitata L ?) 



2 B. lateriflora Muhl. "Whole plant rough-pubescent, monoecious; lvs. all alter- 

 nate, ovate-lanceolate, long-acuminate, dentate, rounded and subpcltato at base, <m 



