30 Euphorbiacese — Urticaceae. 



\\,—MERCURIALIS. 



MERCURIA'LIS PEREN'NIS (105). Dog's Mercury. 3—4. Stem 

 (1261) 6 — 18 in. erect with opposite petiolate ovate serrate stipulate leaves, 

 flow^ers dioecious minute, staminate flovv^ers in interrupted axillary 

 spikes, sepals 3, stamens 8 — 20, pistillate flowers in clusters hidden 

 among the leaves, ovary 2-ceiled, styles long recurved, fruit dicoccous 

 hispid. Shady places. Fig. p. 120. 



\\\.—BUXUS. 



BUX'US SEMPERVrRENS. Box. 4—5. An evergreen shrub, 



( 1 260) leaves alternate oblong exstipulate, flowers moncecious small sessile in 



axillary clusters, perianth usually 4-cleft, stamens 4, styles 3, capsule 



ovoid horned 3-celled, each cell with two black seeds. Chalk hills 



and in shrubberies. 



ORDER 66. — Urticaceae. 



Monoecious or dioecious, flowers rarely perfect. Calyx of staminate 

 flowers of 4 — 5 sepals. Stamens 4 — 5 opposite the sepals. Calyx of pistil- 

 late flowers tubular or 3 — 5-cleft or of I membranaceous sepal. Ovary 

 I -seeded. Fruit indehiscent dry. 



Stem twining, Humulus I. 



Stem erect, 509 



509 Leaves opposite with stinging hairs, . . . Urtica II. 



509 Leaves alternate with simple hairs, . . Parietaria III. 



\.— HUMULUS. 



HU'MULUS LU'PULUS (82). Hop. 7—9. Stem long climbing 



(1265) rough almost prickly, leaves opposite cordate petiolate, upper leaves 

 ovate, lower leaves 3 — 5-lobed rough, flowers dioecious greenish yellow 

 minute, staminate flowers in lax panicles, pistillate flowers in catkins 

 consisting of the large concave bract-like sepals, at the base of each of 

 which are 2 styles and i ovary. Hedges. 



W. — URTICA. 



Flowers monoecious or dioecious, staminate flowers with a 4-partite calyx 

 and a sessile brush-like stigma. 



URTI'CA U'RENS (107). Small Nettle. 6—9. Stem 1—2 ft. high, 

 (1268) leaves i — 2 in. elliptical serrate, staminate and pistillate flowers in the 

 same panicle Waste places. 



URTI'CA DIOrCA (112). Great Nettle. 6—9. Stem 2—4 ft. high, 



(1266) leaves 2 — 4 in. ovato-cordate serrate, staminate panicles lax, pistillate 

 dense. Waste places. Fig. p. 173. 



