- Betula-alnus Marshall
- Duschekia Opiz
- Alnaster Spach
- Clethropsis Spach
- Semidopsis Zumagl.
- Alnobetula (W.D.J.Koch) Schur.
- Cremastogyne (H.J.P.Winkl.) Czerep.
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Subgenus Alnus:
Trees with stalked shoot buds, male and female catkins produced in
autumn (fall) but stay closed over winter, pollinating in late winter or
early spring, about 15–25 species, including:
- Alnus acuminata Kunth – Andean alder, aliso. Mexico, Central and South America.
- Alnus cordata (Loisel.) Duby – Italian alder. Italy, Corsica.
- Alnus cremastogyne Burkill – China.
- Alnus firma Siebold & Zucc. – Kyūshū Island in Japan
- Alnus glutinosa (L.) Gaertn. – black alder. Europe, Central Asia.
Speckled alder (Alnus incana subsp. rugosa)—leaves
- Alnus incana (L.) Moench – speckled alder or grey alder. Eurasia, North America
- Alnus hirsuta (Spach) Rupr. – Manchurian alder. Japan, Korea, Manchuria, Siberia, Russian Far East
- Alnus oblongifolia Torr. – Arizona alder. Arizona, New Mexico, Sonora, Chihuahua
- Alnus tenuifolia Nutt. – thinleaf or mountain alder. Northwestern North America
- Alnus japonica (Thunb.) Steud. – Japanese alder, Japan, Korea, Taiwan, eastern China, Russian Far East
- Alnus jorullensis Kunth – Mexican alder. Mexico, Guatemala, Honduras.
- Alnus matsumurae Callier – Honshū Island in Japan
- Alnus nepalensis D.Don – Nepalese alder. Himalayas, Tibet, Yunnan, Nepal, Bhutan, Myanmar, Thailand.
- Alnus orientalis Decne. – Oriental alder. Southern Turkey, northwest Syria, Cyprus, Lebanon, Palestine, Iran
- Alnus rhombifolia Nutt. – white alder. California, Nevada, Oregon, Washington, Idaho, Montana
- Alnus rubra Bong. – red alder. Alaska, Yukon, British Columbia, California, Oregon, Washington, Idaho, Montana.
Leaves of the tag alder
Subgenus Clethropsis.
Trees or shrubs with stalked shoot buds, male and female catkins
produced in autumn (fall) and expanding and pollinating then, three
species:
- Alnus formosana (Burkill) Makino – Formosan alder. Taiwan
- Alnus maritima (Marshall) Muhl. ex Nutt. – seaside alder. United States (Georgia, Delaware, Maryland, Oklahoma).
- Alnus nitida (Spach) Endl. – Himalayan alder. Western Himalaya, Pakistan, India, Nepal.
Subgenus Alnobetula.
Shrubs with shoot buds not stalked, male and female catkins produced in
late spring (after leaves appear) and expanding and pollinating then,
one to four species:
Green alder (Alnus viridis)
- Unknown subgenus
Hybrids[edit]
| Mill. |
| Type species |
Alnus glutinosa
(L.) Gaertn.
|
 |
| Synonyms[1] |
- Betula-alnus Marshall
- Duschekia Opiz
- Alnaster Spach
- Clethropsis Spach
- Semidopsis Zumagl.
- Alnobetula (W.D.J.Koch) Schur.
- Cremastogyne (H.J.P.Winkl.) Czerep.
|
Classification[edit]
The genus is divided into three subgenera:
Subgenus Alnus:
Trees with stalked shoot buds, male and female catkins produced in
autumn (fall) but stay closed over winter, pollinating in late winter or
early spring, about 15–25 species, including:
Speckled alder (Alnus incana subsp. rugosa)—leaves
- Alnus incana (L.) Moench – speckled alder or grey alder. Eurasia, North America
- Alnus hirsuta (Spach) Rupr. – Manchurian alder. Japan, Korea, Manchuria, Siberia, Russian Far East
- Alnus oblongifolia Torr. – Arizona alder. Arizona, New Mexico, Sonora, Chihuahua
- Alnus tenuifolia Nutt. – thinleaf or mountain alder. Northwestern North America
- Alnus japonica (Thunb.) Steud. – Japanese alder, Japan, Korea, Taiwan, eastern China, Russian Far East
- Alnus jorullensis Kunth – Mexican alder. Mexico, Guatemala, Honduras.
- Alnus matsumurae Callier – Honshū Island in Japan
- Alnus nepalensis D.Don – Nepalese alder. Himalayas, Tibet, Yunnan, Nepal, Bhutan, Myanmar, Thailand.
- Alnus orientalis Decne. – Oriental alder. Southern Turkey, northwest Syria, Cyprus, Lebanon, Palestine, Iran
- Alnus rhombifolia Nutt. – white alder. California, Nevada, Oregon, Washington, Idaho, Montana
- Alnus rubra Bong. – red alder. Alaska, Yukon, British Columbia, California, Oregon, Washington, Idaho, Montana.
Leaves of the tag alder
Subgenus Clethropsis.
Trees or shrubs with stalked shoot buds, male and female catkins
produced in autumn (fall) and expanding and pollinating then, three
species:
- Alnus formosana (Burkill) Makino – Formosan alder. Taiwan
- Alnus maritima (Marshall) Muhl. ex Nutt. – seaside alder. United States (Georgia, Delaware, Maryland, Oklahoma).
- Alnus nitida (Spach) Endl. – Himalayan alder. Western Himalaya, Pakistan, India, Nepal.
Subgenus Alnobetula.
Shrubs with shoot buds not stalked, male and female catkins produced in
late spring (after leaves appear) and expanding and pollinating then,
one to four species:
Green alder (Alnus viridis)
- Unknown subgenus
Hybrids[edit]
| Synonyms[3] |
- Alnus glutinosa var. vulgaris Spach, nom. inval.
- Alnus vulgaris Hill, nom. inval.
- Betula alnus var. glutinosa L.
- Betula glutinosa (L.) Lam.
|
| Synonyms[3] |
- Alnus glutinosa var. vulgaris Spach, nom. inval.
- Alnus vulgaris Hill, nom. inval.
- Betula alnus var. glutinosa L.
- Betula glutinosa (L.) Lam.
|
| Synonyms[2] |
- Amygdalus amara Duhamel
- Amygdalus communis L.
- Amygdalus dulcis Mill.
- Amygdalus fragilis Borkh.
- Amygdalus sativa Mill.
- Druparia amygdalus Clairv.
- Prunus amygdalus Batsch
- Prunus communis (L.) Arcang.
- Prunus communis Fritsch
- Prunus ramonensis (Danin) Eisenman
- Prunus stocksiana (Boiss.) Burkill
|
-
| Synonyms[1] |
- Apocynum album Greene
- Apocynum angustifolium Wooton nom. illeg.
- Apocynum arenarium Greene
- Apocynum bebbianum Greene
- Apocynum bolanderi Greene
- Apocynum breweri Greene
- Apocynum canadense Shecut
- Apocynum carolinii Nieuwl.
- Apocynum cervinum Greene
- Apocynum cinereum Nieuwl. nom. illeg.
- Apocynum cordigerum Greene
- Apocynum cuspidatum Greene ex Bég. & Belosersky
- Apocynum densiflorum Greene
- Apocynum dictyotum Greene
- Apocynum dimidiatum Raf.
- Apocynum estellinum Greene
- Apocynum farwellii Greene
- Apocynum greeneanum Bég. & Belosersky
- Apocynum hypericifolium Aiton
- Apocynum isophyllum Greene
- Apocynum ithacense Greene
- Apocynum laurinum Greene
- Apocynum littorale Greene
- Apocynum longifolium Greene
- Apocynum macounii Greene ex Bég. & Belosersky
- Apocynum missouriense Greene
- Apocynum myrianthum Greene
- Apocynum nemorale G.S.Mill.
- Apocynum neogeum Bég. & Belosersky
- Apocynum nevadense Goodd.
- Apocynum oblongum Greene
- Apocynum oliganthum Greene
- Apocynum palustre Greene
- Apocynum piscatorium Douglas ex A.DC
- Apocynum platyphyllum Greene
- Apocynum procerum Greene
- Apocynum pubescens Mitch. ex R.Br.
- Apocynum purpureum Tausch
- Apocynum salignum Greene
- Apocynum sibiricum Jacq.
- Apocynum subuligerum Greene
- Apocynum suksdorfii Greene
- Apocynum thermale Greene
- Apocynum tomentulosum Nieuwl.
- Apocynum venetum A.DC. nom. illeg.
- Cynopaema cannabinum (L.) Lunell
- Cynopaema hypericifolium (Aiton) Lunell
- Forsteronia pavonii A.DC.
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