index KINDOM PLANT KINDOM phylum TRACHEOPHYTA (VASCULAR PLANTS) phylum SPERMATOPHYTA (SEED PLANTS) phylum ANGIOSPERMAE (FLOWERS) CLASS DICOTS CLASS ROSIDAE ORDER ROSANAE ORDER FAGALES FAMILY BETULACEAE
GENUS ALNUS

ALNUS (ALDERS)





BBALLBLU.GIF Inception: -35 million years ago

LEAVESAUG29.JPG BBALLBLU.GIF The leaves alternate, simple, and serrated.



CATS20070829.JPG BBALLBLU.GIF The flowers are catkins with elongate male catkins on the same plant as shorter female catkins.
Female catkins are woody and do not disintegrate at maturity, (similar to conifer cones.)
Largly wind-pollinated


Picture: Inmature catkin (female cone)
Aug 29





BBALLBLU.GIF Alders establish symbioses with the nitrogen-fixing Actinobacteria Frankiella alni.


BBALLBLU.GIF 30 species

RULERSPINgif RULERMAR Three subgenus RULERYEL
RULERMAR

Subgenus Alnus. Trees


species Alnus. acuminata - (Andean Alder) - Andes Mountains, South America.
species Alnus. cordata - (Italian Alder) - Italy.
species Alnus. cremastogyne
species Alnus. glutinosa - (Black Alder) - Europe.
species Alnus. incana - (Grey Alder) - Europe & Asia.
species Alnus. oblongifolia - (Arizona Alder) - Southwestern North America.
species Alnus. rugosa - (Speckled Alder) - Northeastern North America.
species Alnus. tenuifolia - (Thinleaf Alder or Mountain Alder) - Northwestern North America.
species Alnus. japonica - (Japanese Alder) - Japan.
species Alnus. jorullensis - (Mexican Alder) - Mexico, Guatemala.
species Alnus. nepalensis - (Nepalese Alder) - Eastern Himalaya, southwest China.
species Alnus. orientalis - (Oriental Alder) - Southern Turkey, northwest Syria

species Alnus. rhombifolia - (White Alder) - Interior western North America.
RHOMBIFOLIA

species Alnus. rubra - (Red Alder) - West coastal North America.
RUBRA

species Alnus. serrulata - (Hazel alder, Tag Alder or Smooth alder) - Eastern North America.
species Alnus. subcordata - (Caucasian Alder) - Caucasus, Iran.
RULERMAR

Subgenus Clethropsis.


Species Alnus. formosana - (Formosan Alder) Taiwan
Species Alnus. maritima - (Seaside Alder) East coastal North America
Species Alnus. nitida - (Himalayan Alder) Western Himalaya.
RULERMAR

Subgenus Alnobetula. Shrubs


Species Alnus.viridis - Green Alder.
Species Alnus. viridis. subsp viridis. - Eurasia
Species Alnus. viridis. subsp maximowiczii - Japan.
Species Alnus. viridis. subsp crispa - Northern North America.
Species Alnus. viridis. subsp sinuata - (Sitka Alder or Slide Alder). Western North America




RULERYEL
RedAlderFtBrag.JPG, 36 kB RedAlder
Red Alder
Ft Bragg
Mckericher
2009.JUL.22

RULERMAR

RULERBOWGIF