Betulacese. 
345 
m 
519. Ostrya. Ostrya. XXI, 11. 
1. Ls oval, acuminate, feebly cordate at the base, double¬ 
toothed.—Tess., Graub., Misox (above Grono : Coaz). 4 
carpinifolia Scop. 1981. 
101. Betulacese. 
520. Betula. Birch. XXI , 10. 
1. Ls oval or oval-rhomboidal, acute or acuminate, long- 
petioled. Trees or (especially on peat-moss) shrubs. 
Type of B. alba ..... . 2 
— Ls orbicular or orbicular-oval, obtuse or subobtuse, 
shortly petioled. Low shrubs . . . . . 3 
2. Ls triangular or rhomboidal-triangular, long-acuminate, 
double-toothed, glabr. when full grown. Fr. surrounded 
by a wing twice as broad as itself. Branches gen. pend¬ 
ant. B. alba auct.—Woods, peat-moss; everywhere. 4 
verrucosa Ehrh. 1982. 
— Ls oval or oval-rhomboidal, sometimes slightly cordate, 
acute or short-acuminate, unequally or doubly toothed, 
when full-grown tufted with hairs underneath, at least 
in the axils of the nerves. Fr. surrounded by a wing 
as broad as itself. Twigs stretched forwards, often pu¬ 
bescent. B alba L. ex Fr., B. glutinosa Wal^f., B. tor- 
facea Schleich.—? b. Murithii Gaud. Ls shortly petioled, 
broad, coarsely double-toothed; scales of the fem. cat¬ 
kins large, covered with a dense pubescence. (Mauvoisin 
in the Bagnethal, probably a good species.)—Peat-moss, 
especially in the mountain regions, often with Pinus 
montana; distrib. 4 . . pubescens Ehrh. 1983. 
3. Ls 15—20 mm long, orbicular-oval, crenate-dentate. Fem. 
catkins shortly stalked. A shrub of 10— dm. B. nana- 
pubescens.—Peat-moss in the Jura; rare. 5 
* intermedia Thom. 1984 
— Ls smaller, suborbicular or even broader than long, 
obtuse, deeply crenate, the crenelures rounded-obtuse. 
Fem. catkins almost sessile. A small shrub of 4—6 dm. 
—Peat-bogs in the Jura, Schwarzeneck,-Einsiedeln. 5, G 
nana L. 1985. 
521. Alnus. Alder. XXI, 9. 
1. Fem. catkins of the present year appearing with the ls. 
Fr. surrounded by abroad, transparent, membranous 
wing. Ls oval, acute, double-toothed, green on both 
sides.—b. minor Pari, (brembana Rota). Dwarf form with 
much smaller ls, 10—15 mm. —Alp. and subalp., covering 
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