Difference between revisions of "Spiraea stevenii"
in N. L. Britton et al., N. Amer. Fl. 22: 247. 1908.
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|elevation=0–2000 m | |elevation=0–2000 m | ||
|distribution=B.C.;N.W.T.;Yukon;Alaska;e Asia. | |distribution=B.C.;N.W.T.;Yukon;Alaska;e Asia. | ||
| − | |discussion=<p>Spiraea stevenii has been frequently referred to as S. beauverdiana; the nomenclatural history of this was well summarized by L. J. Uttal (1973), who noted that the type for S. beauverdiana is a specimen that belongs in the circumscription of S. aemeliana. A study of the pollen morphology of S. betulifolia and S. stevenii (S. beauverdiana) (T. A. Poljakova and G. N. Gataulina 2008) showed substantial differences between these two taxa. Examination of the carpel anatomy of various species of Spiraea (C. Sterling 1966) showed that S. stevenii differs from other species except S. lucida.</p> | + | |discussion=<p><i>Spiraea stevenii</i> has been frequently referred to as S. beauverdiana; the nomenclatural history of this was well summarized by L. J. Uttal (1973), who noted that the type for S. beauverdiana is a specimen that belongs in the circumscription of S. aemeliana. A study of the pollen morphology of S. betulifolia and <i>S. stevenii</i> (S. beauverdiana) (T. A. Poljakova and G. N. Gataulina 2008) showed substantial differences between these two taxa. Examination of the carpel anatomy of various species of <i>Spiraea</i> (C. Sterling 1966) showed that <i>S. stevenii</i> differs from other species except <i>S. lucida</i>.</p> |
|tables= | |tables= | ||
|references= | |references= | ||
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|publication year=1908 | |publication year=1908 | ||
|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/8f726806613d60c220dc4493de13607dd3150896/coarse_grained_fna_xml/V9/V9_678.xml |
|subfamily=Rosaceae subfam. Amygdaloideae | |subfamily=Rosaceae subfam. Amygdaloideae | ||
|tribe=Rosaceae tribe Spiraeeae | |tribe=Rosaceae tribe Spiraeeae | ||
Revision as of 18:18, 18 September 2019
Shrubs, 1–10 dm. Stems ascending to prostrate, rarely dying to ground, rarely branched. Leaves: petiole 0.5–6 mm; blade ovate to elliptic, 1–6 × 0.5–2.5 cm, membranous, base obtuse, margins regularly to irregularly serrulate on distal 1/4–1/2 to crenate or entire (long shoot leaves sometimes serrate on full blade), teeth rounded, number of primary and secondary serrations 0–1 times number of secondary veins (excluding inter-secondary veins), venation pinnate cladodromous, secondary veins not prominent, apex obtuse, surfaces glabrous. Inflorescences mostly terminal, corymbiform (dense), 1–3[–5] × 0.5–3[–5] cm height usually 1 times diam.; branches rarely in axils of leaves, usually glabrous or puberulent, sometimes villous. Pedicels 1–5(–8) mm, usually glabrous or puberulent, sometimes villous. Flowers 4–6 mm diam.; hypanthia hemispheric, 0.7–1 mm, abaxial surface puberulent to pubescent, adaxial glabrate to pubescent; sepals triangular, 1–1.5 mm; petals white, orbiculate, 1.5–2.5 mm; staminodes 10–12; stamens 18–22, 2 times petal length. Follicles oblanceoloid, 2.5–3.5 mm, puberulent.
Phenology: Flowering Jun–Sep; fruiting Jul–Nov.
Habitat: Meadows, tundra, open woods, thickets, stream banks, lake edges, alpine areas
Elevation: 0–2000 m
Distribution
B.C., N.W.T., Yukon, Alaska, e Asia.
Discussion
Spiraea stevenii has been frequently referred to as S. beauverdiana; the nomenclatural history of this was well summarized by L. J. Uttal (1973), who noted that the type for S. beauverdiana is a specimen that belongs in the circumscription of S. aemeliana. A study of the pollen morphology of S. betulifolia and S. stevenii (S. beauverdiana) (T. A. Poljakova and G. N. Gataulina 2008) showed substantial differences between these two taxa. Examination of the carpel anatomy of various species of Spiraea (C. Sterling 1966) showed that S. stevenii differs from other species except S. lucida.
Selected References
None.