200 DICOTYLEDONS. SALICIN.E. AinUS. 



o3. S. caprea, leaves ovato-elliptical acute serrated and undu- 

 lated at the margin downy beneath, stipules semieordate, ger- 

 mens pedicellate lanceolato-subulate silky, stigmas sessile un- 

 divided, p. 286. — IVoods. 



39. S. acuminata, " leaves lanceolato-oblong pointed waved 

 slightly toothed downy beneath, stipules kidney-shaped, cap- 

 sules ovate tapering." p. 286. — Moist ivoods. 



40. S. stipularis, leaves lanceolate very indistinctly crenate white 

 and downy beneath, stipules large semieordate acute, " ger- 

 mens shortly pedicellate ovate downy, style a little elongated, 

 stigmas long awl-shaped recurved entire, nectary cylindrical." 

 p. 286 . — Willniu -grounds. 



41. 8. 'niollissijna,\oave8 lanceolate obscurely crenate white and 

 covered with silky pubescence beneath, stipules rather small 

 semieordate acute, germens lanceolato-subulate very silky 

 shortly pedicellate, style elongated, stigmas long linear mostly 

 entire, p. 287. — WiUnw-grounds. 



42. S. viminalis, leaves linear lanceolate obscurely crenate white 

 and silky beneath, stipules very small sublanceolate, branches 

 straight and twiggy, germens upon very short footstalks silky 

 lanceolato-subulate, style elongated, stigmas long linear mostly 

 entire. — p. 287. — WiUow- grounds, ^c. 



43. S. alba, leaves elliptical lanceolate regularly glanduloso-ser- 

 rate acute silky beneath often so above, germens ovato-acumi- 

 nate i\earh' sessile ghxbrous, stigmas nearly sessile short recurved 

 bifid, scales short pubescent at the margin, p. 287. — Mea- 

 dows and hedges. 



2. POPULUS. 

 Dioecious. Catkins cylindrical ; scales lacerated. Barren Fl. 

 Antli. S — 30 arising from a turbinate, oblique, entire, single 

 perianth. Fertile Fl. P^r/G«//i turbinate (entire)? Stigmas 4. 

 Caps, superior, 2-celled, 2-valved, many-seeded. Seeds co- 

 inose. 



1. P. alba, leaves roundish cordate lobed toothed glabrous above 

 downy and very white beneath, fertile catkins ovate, stigmas 

 4. p. 288. — Planlaiinns. 



2. P. iremula, leaves nearly orbicular broadly toothed glabrous 

 on both sides, petioles compressed, " stigmas 4, auricled at 

 the base." Sm. p. 289. — Moist woods. 



3. P. nigra, leaves deltoid acute serrated glabrous on both sides, 

 fertile catkins cylindrical lax, '•' stigmas 4." Sm. p. 289. — 

 Planlatio7is. 



3. ALNUS. 



Moncecioui. Barren FL with long cylindrical catkins; their 



scales 3-lobed, 3-/lowered. Perianth 4-partite. Siam. 4. 



Fertile FL with ovate catkins', their scales subtrifid with 2 



flowers. Perianth 0. Styles 2. Fruit a Nut, compressed. 



