OF THE GENERA. lv 



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

 Stamens 3 5. FERTILE FL. Ament globose; scales 1-ffowered. Styles 

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



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

 or lanceolate. STERILE PL. Stamens 3. FERTILE PL. Perianth with a 

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

 branaceous in fruit. Stigma 1, minute, capitate, sessile. Nut minutely 

 papillose, straight. Urlicacece, p. 3 15. 



ORDER IV. TETRANDRIA. 4 Stamens. 



ERIOCAULON. Flowers collected into a compact scaly head. STERILE 

 PL. 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-parfced. Capsule 2 3-celled. Eriocaulacece, p. 370. 



ALNUS. STERILE PL. Ament long, cylindric ; scales 3-lobed, 3-flowered. 

 Perianth 4-parted. FERTILE PL. Ament ovoid-oblong; scales subtrifid, 

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

 p. 326. 



BETULA. STERILE FL. Ament imbricate, cylindric ; scales ternate, the 

 middle one bearing the stamens. FERTILE PL. Ament ovoid-oblong; 

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

 cea, p. 325. 



BCEHMERIA. STERILE PL. 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. Urticaceee, 

 p. 316. 



URTICA. STERILE PL. Perianth single, of 4 roundish obtuse leaves, 

 containing the cup-shaped rudiment of a germ. FERTILE PL. Perianth 

 mostly of ^2 persistent leaves. Stigma 1. Nut orbicular-ovate, compressed, 

 shining. Urlicacece, p. 314. 



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

 PERFECT PL. Perianth 4-parted, persistent. Filaments at first incurved, 

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

 perianth. Urticacees, p. 316. 



MORUS. STERILE PL. 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. Morucece, p. 317. 



(Mijriophyttum in ORDER HEXANDRIA.) 



ORDER V. PENTANDRIA. 5 Stamens. 



CROTONOESIS. STERILE PL. Perianth 5-parted, with 2 petaloid scales. 

 FERTILE FL. Perianth 5-parted. Stigmas 3, twice bifid. Capsule 1- 

 seeded, not opening. Eupliorbiacece, p. 311. 



AMARANTHUS. Perianth deeply 3 5-parted. STERILE PL. Stamens 

 35. PERTfLE FL. Styles 3. Capsule 1-celled, 1-seeded, opening trans- 

 versely all round. Amarantkaccce, 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 



