E-Flora BC: Electronic Atlas of the Flora of BC

Alnus alnobetula subsp. sinuata
Sitka alder
Betulaceae (Birch family)

Introduction to Vascular Plants

General:
Deciduous shrub or tree, 1-5 m tall; pointed axillary buds without stalks; bark scaly, sometimes lichen-covered, yellowish-brown or grey.

Leaves:
Alternate, deciduous, smooth, finely toothed 1-2 times, oval with pointed tips, 4-10 cm long, brownish in the fall.

Flowers:
Inflorescence of male and female catkins which open at the same time as the leaves on current year's growth; male catkins unstalked.

Fruits:
Small nutlets, with broad wings; female cones 1.5-2 cm long, egg-shaped.

Notes:
Three subspecies occur in BC.

Source: The Illustrated Flora of British Columbia

Ecological Framework for Alnus alnobetula ssp. sinuata

The table below shows the species-specific information calculated from
original data (BEC database) provided by the BC Ministry of Forests and Range.
(Updated August, 2013)

Site Information	Value / Class
Site Information	Avg	Min	Max
Elevation (metres)	1172	0	2500
Slope Gradient (%)	22	0	205
Aspect (degrees) [0 - N; 90 - E; 180 - S; 270 - W]	27	0	360
Soil Moisture Regime (SMR) [0 - very xeric; 4 - mesic; 8 - hydric]	4	0	8
Modal Nutrient Regime Class	C
# of field plots species was recorded in:	3292
Modal BEC Zone Class	ESSF
All BEC Zones (# of stations/zone) species was recorded in	AT(2), BG(4), BWBS(238), CMA(1), CWH(92), ESSF(802), ICH(648), IDF(186), MH(26), MS(580), PP(7), SBPS(16), SBS(575), SWB(2)
Source: Klinkenberg 2013

Scientific Name	Origin Status	Provincial Status	BC List (Red Blue List)	COSEWIC
Alnus alnobetula ssp. crispa	Native	S4	Yellow	Not Listed
Alnus alnobetula ssp. fruticosa	Native	S5?	Yellow	Not Listed
Alnus alnobetula ssp. sinuata	Native	S5	Yellow	Not Listed

BC Ministry of Environment: BC Species and Ecosystems Explorer.

Photograph click to collapse contents

Map click to expand contents

Species Information click to expand contents

Ecology click to expand contents

Habitat and Range click to expand contents

Status Information click to expand contents

Synonyms click to expand contents

loading