Key to Betula

View taxon page for Betula

(For a list of species in Betula, use the above link.)

Jepson Manual glossary definitions can be seen by moving your cursor over words underlined with dots.

1. Plant < 3 m; 

leaf 

Organ arising from a stem, generally composed of a stalk (petiole) and a flat, expanded, green, photosynthetic area (blade); distinguished from a leaflet by the presence in its axil of a bud, branch, thorn, or flower; sometimes with lateral, basal appendages (stipules); either simple (toothed, lobed, or dissected but not divided into leaflets) or compound (divided into leaflets).

leathery, tip round, margin 

crenate 

Pertaining to margins with shallow, rounded teeth, between which are usually acute sinuses (i.e., scalloped)

..... B. glandulosa

1' Plant > 3 m; leaf not leathery, tip 

acute 

Having a short-tapered, sharp tip, the sides convex or straight and converging at less than a right angle.

, margin doubly 

serrate 

Having margins with sharp, fine to coarse teeth generally pointing tipward, not outward; margins with such teeth on such primary teeth are doubly serrate.

except at base ..... B. occidentalis

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