Flora of the Hawaiian Islands
Monocotyledon Literature for Arundina graminifolia
Wagner et al., 1990, 1999.
   Orchidaceae -- The Orchid Family Bibliography
      Arundina graminifolia

Common name(s): bamboo orchid
General Information
DistributionNative to southeastern Asia, India, Malesia, and a number of Pacific islands.In the Hawaiian Islands, naturalized on Kaua`i, O`ahu, Maui, Hawai`i.

Tufted terrestrial herbs 10-25 dm tall, arising from short horizontal rhizomes; stems usually crowded together, completely enclosed by a series of persistent sheathing leaf bases.
Leaves firm, grass-like, linear-lanceolate, 8-30 cm long, 0.5-1.5(-2) cm wide, midrib impressed on upper surface, conspicuously raised on lower surface, margins entire, sheaths 2-4 cm long.
Flowers in terminal, racemose or paniculate inflorescences 10-70 cm long, peduncles slender, dark green or reddish purple, glabrous, bracts erect, broadly ovate, 3-7 mm long; sepals pale pink to rose, the dorsal one ascending, elliptic to elliptic-obovate, 3-4.5 cm long, ventral sepals appressed to surface of labellum, elliptic, 3-4.5 cm long; lateral petals similar in color to sepals, spreading or reflexed horizontally, broadly elliptic to obovate, 2.5-3.8 cm long; labellum pale to dark reddish purple, ± with yellow markings on the throat, 4-5 cm long, entire or weakly 3-lobed, middle lobe undulate, deeply cleft, margins irregularly crenate.
Capsules pendent, cylindrical, 6-ribbed, 3.5-5.5 cm long.
2n = 32, 40, 42