Difference between revisions of "Alnus maritima"
N. Amer. Sylv. 1: 50. 1842.
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| − | |basionyms={{Treatment/ID/ | + | |basionyms={{Treatment/ID/Basionym |
|name=Betula-alnus maritima | |name=Betula-alnus maritima | ||
|authority=Marshall | |authority=Marshall | ||
| + | |publication_title=Arbust. Amer., | ||
| + | |publication_place=20. 1785 | ||
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|publication year=1842 | |publication year=1842 | ||
|special status=Endemic;Selected by author to be illustrated | |special status=Endemic;Selected by author to be illustrated | ||
| − | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/ | + | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V3/V3_590.xml |
|subfamily=Betulaceae subfam. Betuloideae | |subfamily=Betulaceae subfam. Betuloideae | ||
|genus=Alnus | |genus=Alnus | ||
Revision as of 20:54, 24 September 2019
Shrubs or trees, to 10 m; crowns narrow. Bark light gray, smooth; lenticels small, inconspicuous. Winter buds stipitate, ovoid to ellipsoid, 2.5–5 mm, apex rounded; stalks 1–3 mm; scales 2–3, subequal, often poorly developed, heavily resin-coated. Leaf blade narrowly elliptic, oblong, or narrowly obovate, 4.5–9 × 2–5 cm, leathery, base acute to cuneate, margins flat, teeth low, single, relatively distant, apex acute, obtuse, or rounded; surfaces abaxially mostly glabrous, resin-coated when young. Inflorescences: catkins formed during same season as flowering; staminate catkins in 1 terminal cluster of 2–4, 2–6 cm; pistillate catkins solitary in leaf axils proximal to staminate catkins. Flowering in late summer or early fall. Infructescences ovoid, 1.2–2.8 × 1.2–2.2 cm; peduncles 5–10 mm. Samaras elliptic, wings reduced to narrow, leathery ridges. 2n = 28.
Phenology: Flowering late summer–early fall.
Habitat: Along edges of ponds and small streams, often in standing water
Elevation: 0–100 m
Distribution
Del., Md., Okla.
Discussion
Alnus maritima consists of widely disjunct populations in Delaware, Maryland, and southern Oklahoma. The populations probably represent remnants of Pleistocene and post-Pleistocene distributions and migrations. It is our only member of the predominantly Asian fall-blooming Alnus subg. Clethropsis.
Selected References
None.