342 



731. POPULUS. 



2. cauesceus. L. subrotuudo-ovate, an- 

 gulato-dentate, lioary beaeatli. Shoots cottony, 

 whitisli. Scales of fertile Catldn cloven at 

 top. Stigmas 8. l.T. 8, 4. Moist gravel or 

 sand. 



3. tremula. L. nearly orbicular, dentate- 

 sinuate. Root-sboots hairy ; upper smooth. 

 Scales of fertUe Catkin digitate, incise. Stig- 

 mas 4, auricled. s.T. 3, 4. Hoist woods. 



B. Stamens 12-30. Shoots all smooth. 



4. ni^a. L. triangular, acuminate, serrate ; 

 angles rounded ; margin smooth. Branches 

 spreading. Stigmas 4. l.T. 4. }Vet banks. 



Besides these, we have, planted in public 

 walks and on road-sides, P. p?jramidalis or 

 dilatata, the common Lombardy Poplar, with 

 erect branches, and P. monilifera, with a 

 downy margin to the L., both in this division. 



Tribe III. BETULINE^. 

 732. BETULA. 



1. alba. L. deltoideo-ovate, acute, doubly 

 serrate. Catkin of Fr. pendulous. Wing 

 twice as broad as seed, and reaching to extre- 

 mity of stigmas. (Fr. shorter than the rounded 

 membranous margin, Bab.) T. 4, 5. Sandy 

 or gravelly woods. 



2. pubescens. "L. ovate or rhombic 

 (cordato-ovoid, Bab.), acute or acuminate, 

 doubly serrate. Catldn of Fr. pendulous. 

 Wing as broad as seed, and reaching to its ex- 

 tremity. (Fr. broadly obovate, as long as 

 rounded membranous margin, Bab.) T. 4, 5. 

 Wet and boggy." — Koch. 



3. intermedia. "L. subrotundo-ovate, 

 acutely and somewhat doubly serrato-crenate. 

 Catldn of Fr. stallted. Stalk full -I as long as 

 catkin. Scales trifid: lateral Div. shorter 

 and broader than the middle. Wing usually 

 as wide as seed. 

 Koch. 



4. buxnilis. " L. subrotundo-ovate, un- 

 equally and acutely crenato-serrate. Catkin of 

 Fr. erect, much longer than its stalk. Scales 

 trifid. Div. nearly equal. Wing half width of 

 seed. S. 4. Boggy. Upper Swabia. Salzb. 

 n. e. G." — Koch. 



5. nana. L. nearly round, obtusely crenate. 

 Catkin of Fr. erect, sessUe. Scales trifid. Div. 

 nearly equal. Wing half width of seed. s.S. 

 5. Cold mountain hogs. Sw. G. Sc. 



S. 5, 6. Bogs. Jura."— 



733. ALNUS. 



1. viridis. Perianth of barren Fl. of 3 

 L. Seeds with broad membranous margins. 

 L. ovate, acute, with sharp double serratuves, 

 one-coloured, hairy in the veins beneath. S. 

 5, 6. Granite. Alps." — Koch. 



2. cordifolia. Seeds with a narrow, dis- 

 tinct, but not membranous margin. L. cor- 

 date, serrate. T. 5. Woods. Nap. 



3. pubescens. Perianth of barren Fl. 

 4-cleft. Seeds with a thin edge, but without 

 a distinct margin. L. subrotund or obovate, 

 crenato-serrate, green on both sides. l.S. 3. 

 Moist. Boh. Carlsruhe. — Koch. 



4. incana. Perianth 4-cleft. Seeds not 

 margined. L. ovate, acute, with sharp double 

 sen-atm-es, glaucous and somewhat downy be- 

 neath. l.S. 2, 3. Sides of streams. Alps, 

 e. Ger. Hai-tz. Apenn. 



5. glutinosa. Perianth 4-cleft. Seeds 

 not margined. L. subrotund, very blunt, cii- 

 neate at base, hairless except on the axils of the 

 veins beneath. s.T. 3, 4. Wet. 



Ti-ibelV. PLATANEM 

 734. PLATANUS. 



1. orientalis. L. palmate : divisions lan- 

 ceolate, sinuate. Stip. nearly entire. l.T. 

 Introduced for ornament, bzct wild in the 

 woods at Nicastro in Cal., and in those of the 

 s. and e. of Sic. 



2. cuneata. "L. 3-5 -lobed, dentate, ex- 

 tensively cuneate at base, at last hairless. 

 s.T."— WiLLD. " Torrent of StalfoU in the 

 Cilento, Lucania." — Ten. 



3. acerifolia. "L. cordate, 5-16bed, re- 

 motely toothed, truncate (not cuneate) at base. 

 Nerves branching on the edge of the L. l.T." 

 — WiLLD. " Fbo^j of Abruzzi." — Ten. 



We find also in public walks P. occidentalis, 

 with 5 -angular L., hardly lobed, and a cuneate 

 base. 



Tribe V. MTRICEM 



735. MYRICA. 



1. Gale. L. somewhat cuneato-lanceolatc ; 

 upper part seiTate. Scales of the Catkin acu- 

 minate. s.S. 5. Bogs. 



