Difference between revisions of "Aconogonon alaskanum"
Preslia 46: 150. 1974.
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|name=Polygonum alpinum var. alaskanum | |name=Polygonum alpinum var. alaskanum | ||
|authority=Small | |authority=Small | ||
| + | |rank=variety | ||
|publication_title=Monogr. Amer. Sp. Polygonum, | |publication_title=Monogr. Amer. Sp. Polygonum, | ||
|publication_place=33. 1895 | |publication_place=33. 1895 | ||
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|name=Polygonum alaskanum | |name=Polygonum alaskanum | ||
|authority=(Small) W. Wight ex Harshberger | |authority=(Small) W. Wight ex Harshberger | ||
| + | |rank=species | ||
}} {{Treatment/ID/Synonym | }} {{Treatment/ID/Synonym | ||
|name=Polygonum alpinum subsp. alaskanum | |name=Polygonum alpinum subsp. alaskanum | ||
|authority=(Small) S. L. Welsh | |authority=(Small) S. L. Welsh | ||
| + | |rank=subspecies | ||
}} | }} | ||
|hierarchy=Polygonaceae;Polygonaceae subfam. Polygonoideae;Aconogonon;Aconogonon alaskanum | |hierarchy=Polygonaceae;Polygonaceae subfam. Polygonoideae;Aconogonon;Aconogonon alaskanum | ||
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-->{{#Taxon: | -->{{#Taxon: | ||
name=Aconogonon alaskanum | name=Aconogonon alaskanum | ||
| − | |||
|authority=(Small) Soják | |authority=(Small) Soják | ||
|rank=species | |rank=species | ||
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|publication year=1974 | |publication year=1974 | ||
|special status= | |special status= | ||
| − | |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/f50eec43f223ca0e34566be0b046453a0960e173/coarse_grained_fna_xml/V5/V5_1215.xml |
|subfamily=Polygonaceae subfam. Polygonoideae | |subfamily=Polygonaceae subfam. Polygonoideae | ||
|genus=Aconogonon | |genus=Aconogonon | ||
Revision as of 22:51, 16 December 2019
Plants (30–)50–150(–200) cm. Stems erect, glabrous or densely and retrorsely pubescent. Leaves: ocrea reddish brown, funnelform, 1–2.2 cm, margins oblique, glabrous or pilose; petiole 0.8–3.5(–4) mm; blade narrowly lanceolate to ovate, 5–20 × 2–8 cm, not subcoriaceous, base truncate or obtuse to subcordate, margins sometimes irregularly undulate, ciliate or, rarely, glabrous, apex acuminate, faces not glaucous, glabrous or pubescent. Inflorescences terminal, sometimes also axillary, paniclelike; peduncle 0–4 cm, glabrous or pubescent. Pedicels 0.5–0.1 mm. Flowers 2–4 per ocreate fascicle, all flowers with stamens well developed; perianth white or greenish white, 2–4 mm; tepals dimorphic, rarely slightly so, ovate, apex obtuse; anthers yellow to pink. Achenes included or exserted, tan to grayish brown, not beaked distally, 2.6–3.8 × 2–3 mm, shiny, faces usually not concave. 2n = 20.
Distribution
nw North America, Europe (e Russia).
Discussion
Varieties 2 (2 in the flora).
Aconogonon alaskanum has been considered conspecific with the morphologically similar Eurasian A. alpinum (Allioni) Schur, but the taxa differ in leaf size and achene characters. Nomenclatural issues were clarified by J. T. Kartesz and K. N. Gandhi (1990) and K. L. Chambers (1992).
Selected References
None.
Key
| 1 | Leaf blades pubescent; stems usually densely and retrorsely pubescent | Aconogonon alaskanum var. alaskanum |
| 1 | Leaf blades glabrous except for margins; stems mostly glabrous, rarely pubescent proximal to nodes | Aconogonon alaskanum var. glabrescens |