Pacific Island Ecosystems at Risk (PIER)

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Rhynchospora caduca
Elliott, Cyperaceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Common name(s): [more details]

English: anglestem beaksedge

Habit:  herb

Description:  "Perennials with short-creeping rhizomes; culms loosely to moderately densely tufted, 60-120 cm tall, 1.8-3 mm in diameter near base, 3-4-nodose below the inflorescence, trigonous, smooth.  Leaves basal, a few cauline and well-spaced, herbaceous, linear, shorter than the culm, 3-6 mm wide; sheaths 2-5 cm long, the cauline ones green, the basal ones reddish brown or yellowish brown.  Inflorescences of 4-5 well-spaced, anthelate partial panicles, these decompound, 2-7 cm long, 1.5-3 cm wide, moderately dense, the peduncles exserted, branches numerous, 1-3 cm long, once or twice further branched, each bearing 3-5 spikelets, the lowest 2 leaf-like bracts longer than the subtending partial panicle, the upper bracts as long as or shorter than the subtending partial panicle; spikelets brown, solitary or in clusters of 2-3, subsessile, ovate, 3.5-4.5 mm long, ca. 2 mm wide, subterete; glumes 6-8, the middle 3-6 flower-bearing, 2-4 of them perfect, brown to rusty brown, ovate to broadly so, acute, membranous, margins hyaline, the slender and conspicuous midnerve prolonged into a straight mucro or short awn, the flower-bearing glumes 2.8-3.7 mm long, 2-3 mm wide; perianth bristles 6, longer than the achene (incl. the style base); style base deltoid, 0.6-0.8 mm high and wide, ciliate.  Achenes broadly obovate, lenticular, 1-1.6 mm long, 1-1.4 mm wide, transversely undulate-rugose and cancellate with longitudinally oblong cells"  (Wagner et al., 1999; p. 1428).

Habitat/ecology:  In Hawai‘i, "sparingly naturalized in wet, disturbed areas, 320-1,400 m" (Wagner et al., 1999; p. 1428).

Propagation:  Seed, rhizomes.

Native range:  Southern US

Presence:

Pacific
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
State of Hawaii
Hawaiian Islands
Hawai‘i (Big) Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 1428)
Voucher cited: Shinbara H110 (BISH)
State of Hawaii
Hawaiian Islands
Kaua‘i Island introduced
invasive
Wagner, Warren L./Herbst, Derral R. (1995) (pp. 18-19)
Voucher cited: Hume & Levine 332 (BISH, PTBG)
State of Hawaii
Hawaiian Islands
Maui Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 1428)
State of Hawaii
Hawaiian Islands
Moloka‘i Island introduced
invasive
Wysong, Michael/Hughes, Guy/Wood, K. R. (2007) (p. 4)
Voucher cited: K.R. Wood & Hughes 10563 (PTBG)
State of Hawaii
Hawaiian Islands
O‘ahu Island introduced
invasive
Wagner, Warren L./Shannon, Robynn K./Herbst, Derral R. (1997) (p. 56)
Voucher cited: Takeuchi 8516 (BISH)
Also reported from
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
United States (continental except west coast)
United States (other states)
United States (other states) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)


Need more info? Have questions? Comments? Information to contribute? Contact PIER! (pier@hear.org)

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This page was created on 1 JAN 1999 and was last updated on 22 OCT 2006.