Alnus serrulata (Aiton) Willd.
  • Sp. Pl.
  • Smooth alder, hazel alder

This taxon is accepted by Betulaceae
Notes: More details could be found in The Plant List v.1.1. Originally in The Plant List v.1.0

General Description

Shrubs , open to rather densely ascending, to 10 m. Bark light gray, smooth; lenticels small, inconspicuous. Winter buds stipitate, ellipsoid to obovoid, 3--6 mm, apex mostly rounded; stalks 2--4 mm; scales 2, equal, valvate, moderately to heavily resin-coated. Leaf blade broadly elliptic to obovate, 5--14 × 3.5--8 cm, leathery, base broadly to narrowly cuneate, margins flat, serrulate, without noticeably larger secondary teeth, apex obtuse to rounded; surfaces abaxially glabrous to moderately villous, slightly to moderately resin-coated. Inflorescences formed season before flowering and exposed during winter; staminate catkins in 1 or more clusters of 2--5, 3--8.5 cm, stamens 4; pistillate catkins in 1 or more clusters of 3--5. Flowering before new growth in spring. Infructescences ovoid-ellipsoid, 1--2.2 × 0.6--1.2 cm; peduncles 1--3(--5) mm. Samaras obovate, wings narrower than body, irregularly elliptic or obovate, leathery. 2 n = 28.

"Much like no. 2 [Alnus incana (L.) Moench]; lvs elliptic to obovate, tending to be broadest above the middle, obtuse to rounded, serrate with very fine, sharp, nearly regular teeth, obtuse to cuneate at base, beneath green and glabrous, or thinly pubescent on the veins; 2n=28. Wet soil; N.S. and s. Que. to n. Fla., w. to n. Ind., s. Ill., Mo., Okla., and w. Tex."

Common Names

Smooth alder, hazel alder


 Information From

World Flora Online Data. 2017.
  • A CC0 1.0 Universal (CC0 1.0).
Flora of North America @
'Flora of North America @ eFloras (2008). Published on the Internet [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
  • B Flora of North America Association
New York Botanical Garden
Descriptions of plants should be attributed to the full citation for each individual article, chapter or book that is the source for each record, which should include the authors of original publication.
  • C Content licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
World Flora Online consortium
World Flora Online Data. 2018.
  • D CC0 1.0 Universal (CC0 1.0).
International Union for Conservation of Nature
IUCN 2016. IUCN Red List of Threatened Species. Version 2016-2
  • E See IUCN Terms and conditions of use