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Published In: Species Plantarum. Editio quarta 4(1): 336. 1805. (Sp. Pl.) Name publication detailView in BotanicusView in Biodiversity Heritage Library
 

Project Name Data (Last Modified On 8/11/2017)
Acceptance : Accepted
Project Data     (Last Modified On 7/9/2009)
Status: Native

 

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2. Alnus serrulata (Aiton) Willd. (common alder, smooth alder, tag alder)

Pl. 303 e–g; Map 1275

Plants shrubs or small trees 1.5–3.0(–6.0) m tall, the bark light gray, smooth. Twigs with the buds 4–5 mm long (excluding the stalk). Petioles 5–18 mm long. Leaf blades elliptical to rhombic, 5–13 cm long, 3.0–7.5 cm wide, the base rounded to narrowed, the tip broadly or bluntly pointed to rounded, the margins finely toothed, not lobed, the teeth 0.2–0.5 mm long, each side of the midrib with 7–11 strong secondary veins. Conelike infructescences 1–2 cm long, the fruits 2.5–4.5 mm long (including the styles), narrowly winged. 2n=28. March–April.

Scattered, mostly south of the Missouri River (eastern U.S. west to Kansas and Texas; Canada). Banks of streams, spring branches, and rivers, fens, acid seeps, and less commonly bottomland forests and margins of lakes and sloughs.

The leaves stay green later than most of our deciduous species. The underside of the blade varies from almost glabrous (only scattered hairs on the main veins) to conspicuously pubescent; the latter form has been called f. noveboracensis (Britton) Fernald.

 


 

 
 
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