OF THE GENERA. Iv 



cordate, acuminate, 1-flowered. Perianth of 2 minute scarious leaves. 

 Stamens 3 — 5. Fkrtile Fl. Anient globose ; scales l-flower*ed, Stj^les 

 2. Nut ovoid-oblong, smooth. Mijricaceec, p. 324. 



Adike. Perianth 3- (sometimes 4-) leaved ; leaves nearly equal, oblong 

 or lanceolate. Sterile Fl. Stamens 3. Fertile Fl. Perianth with a 

 petaloid cucullate scale at the base of each of the leaves inside, mem- 

 branaceous in fruit. Stigma J, minute, capitate, sessile. Nut minutely 

 papillose, straight. Uriicacea:, p. 3 15. 



Order IV.— TETRANDRIA.— 4 Stamens. 



Eriocaulon. Flowers collected into a compact scaly head. Sterile 

 Fl. in the disk. Perianth 4 — 6-cleft, the inner segments nearly to their 

 summit. Stamens 3—6. Fertile Fl. in the margin. Perianth deeply 

 4-parted. Capsule 2 — 3-celled. Eriocaulacecc, p. 370. 



Alnus. Sterile Fl. Ament long, cylindric ; scales 3-lobed, 3-flowered. 

 Perianth 4-parted. Fertile Fl. Ament ovoid-oblong; scales subtrifid, 

 2-flowered. Perianth none. Styles 2. Nut compressed. Bclulacea, 

 p. 326. 



Betula. Sterile Fl. Ament imbricate, cyHndric ; scales ternate, the 

 middle one bearing the stamens. Fertile Fl. Ament ovoid-oblong; 

 scales trifid, 3-flowered. Nut compressed, winged on each side. Beiula- 

 cecB, p. 325. 



Bcehmeria, Sterile Fl. Perianth 4-parted. Fertile Fl. Perianth 

 none, but a cluster of ovate acuminate scales, with a compressed ovary 

 within each scale. Nut ovate, pointed with the subulate style. Urticacccc, 

 p. 316. 



Urtica. Sterile Fl. Perianth single, of 4 roundish obtuse leaves, 

 containing the cup-shaped rudiment of a germ. Fertile Fl. Perianth 

 mostly of 2 persistent leaves. Stigma I. Nut orbicular-ovate, compressed, 

 shining, tfrticacecc^ p. 314. 



Parietaria. Flowers polygamous, surrounded by a many-cleft involucre. 

 Perfect Fl. Perianth 4-parted, persistent. Filaments at first incurved, 

 then expanding with elastic force. Style 1, Nut enclosed by the enlarged 

 perianth. Urticacece, p. 316. 



Morcs. Sterile Fl. in loose spikes. Perianth 4-parted. Fertile 

 Fl. in dense spikes. Perianth 4-parted, becoming baccate. Styles 2. Nut 

 ovate, compressed, covered by the succulent perianth. Moracccc^ p. 317. 



{Mijriopkylluvi in Order HEXANDRIA.) 



Order V.— PENTANDRIA.— 5 Stamens. 



Crotonoesis. Sterile Fl. Perianth 5-parted, with 2 petaloid scales. 

 Fertile Fl. Perianth 5-parted. Stigmas 3, twice bifid. Capsule 1- 

 seeded, not opening. Eupkorhiacece, p. 311. 



Amaranthus. Perianth deeply 3— 5-parted. Sterile Fl. Stamens 

 3 — 5. Fertjle Fl, Styles 3. Capsule 1-celled, 1-seeded, opening trans- 

 versely all round. Amaranthacece, p. 295. 



Xanthium. Heads in glomerate spikes, sterile at the summit, pistillate 

 below. Sterile Fl. Involucre subglobose, many-flowered, with the scales 

 in one series. Receptacle cylindric, chaffy. Corolla short, 5-lobed, some- 

 what hairy. Fertile Fl. Involucre with hooked prickles, surmounted 



