Plants of Hawaii Volcanoes National Park

Scientific Name Pipturus albidus (Hook. & Arnott) A. Gray
Family Urticaceae (Nettle family)

Other Names Hawaiian: mamaki, mamake, waimea (Kaua`i)
Status Endemic
Distribution & Habitat This species grows between 70 and 1,870 m elevations on all the main islands except Ni`ihau and Kaho`olawe (Wagner, et al. 1990: 1308)

They are found in mesic valleys, mesic to wet forests, and diverse mesic forests (Wagner, et al. 1990: 1308).

Locations in this Guide Kipuka Puaulu
General Appearance
These are shrubs or small trees, 2 to 6 m tall.  The smaller forms are generally multi-trunked.  There are some larger individuals that may reach 20 feet in height.  These taller individuals are more likely to be single-trunked (Stone and Pratt 1994: 251). Kipuka Puaulu

Kipuka Puaulu

Thurston Lava Tube (along highway)

Thurston Lava Tube (along highway)

The trunk has bark that is colored grayish brown to reddish brown (Wagner, et al. 1990: 1308).

Leaves
The leaves are usually dark green on the top and range from dull to glossy (Wagner, et al. 1990: 1308).

The leaves are ovate in shape.  They range in size from several inches to as much as 16 inches long.  This is often related to the amount of sunshine with shady areas having the larger leaves (Stone and Pratt 1994: 251).

The leaves themselves are thick and dull green (Stone and Pratt 1994: 251).

There are short hairs on the underside of the leaf. The surface is relatively rough.

The leaves have prominent veins. Look for small teeth on the margin.

Kipuka Puaulu

Kipuka Puaulu

Thurston Lava Tube (along highway)

Thurston Lava Tube (along highway)

Thurston Lava Tube (along highway)

Flowers & Fruits
The flowers are small and grouped into clusters on the stem.  Fruits develop in fleshy white masses along the stem (Stone and Pratt 1994: 251). Kipuka Puaulu

Kipuka Puaulu

Kipuka Puaulu
Kipuka Puaulu

Thurston Lava Tube (along highway)

Kipuka Puaulu

Kipuka Puaulu

Phenology Phenology Notes
Kipuka Puaulu Abundant flowers. 7/15/00
Kipuka Puaulu No flowers 2/13/01
Kipuka Puaulu Abundant flowers. 8/4/01
     
Natural History This is a highly polymorphic species.  It has, at times, been divided into as many as ten separate species.  These don't appear to be variations that show meaningful geographic or ecological trends, so a single species is what is being reported here (Wagner, et al. 1990: 1308).
Conservation
This is one of the hosts of the Kamehameha butterfly (Stone and Pratt 1994: 251). Kipuka Puaulu
Kipuka Puaulu Kipuka Puaulu
Miscellaneous Photos
Other Notes This is a "nettleless" nettle.  It lacks the stinging cells that are characteristic of members of this family elsewhere.

References
Links to Other Sites

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Last Updated: 08/05/03

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