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Cyperus difformis

L. (1756)

This name is accepted

Kingdom: Viridiplantae Phylum: Magnoliophyta Class/Clade: Monocots Order: Poales Family: Cyperaceae Genus: Cyperus

cyperus

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Description

Key Characters:

Growth Form:

Stems:

Roots:

Leaves:

Flowers:

Fruit:

Ploidy:

Habitat:

Elevation Range:

Historical Distribution

Images

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Uses and Culture

USES

Natural History

Statewide Status

Naturalized

Island Status

Kaua'i Naturalized
O'ahu Naturalized
Maui Naturalized
Hawai'i Potentially naturalizing

Dispersal Agents


Pollinators

Bibliography

Name Published In: Cent. Pl. II: 6 (1756)

Other References

Wagner et al. 1990:1395 (K, O); Starr et al. 2002:19 (WM); Starr et al. 2006:35 (EM); Imada & Kennedy 2020:75 (H)

Occurrences

SNo. Scientific Name Locality Habitat Basis of Record Description Recorded By Record Number Island Source Date
1 Cyperus difformis Kawaihau District. Wailua Homesteads, Steps or Loop road above Kuilau Ridge Trail. Next to Keahua Stream near parking lot. Disturbed Riparian w/ Sphagneticola trilobata, Commelia diffusa, Cenchrus, Clidemia, Ageratum. Few scattered between parking lot and stream in puddles Preserved_Specimen Spikelets globose red-brown with light green margins. Tangalin, N. 5142 Kauai BISH 2021-03-23
2 Cyperus difformis W Maui, Lahaina District, Olowalu Valley, along ditch Occasional. Along irrigation system with other weeds. Preserved_Specimen Herbs Oppenheimer, H.L. 71603 Maui BISH 2016-07-13
3 Cyperus difformis Morgan Toledo Taro Farm, Waipio Valley, Big Island, Hawaii Growing on banks of taro loi, just at water's edge. Preserved_Specimen Erect clumping sedge, 3+ rays with clusters of spikelets. Crago, L.M. 2005093 Hawaii BISH 2005-03-19
4 Cyperus difformis East Maui, Hana District, east of Nuaailua Bay. Locally common herb in newly disturbed small landslide along a coastal freshwater seep. Preserved_Specimen Oppenheimer, H.L. 81225 Maui BISH 2012-08-14
5 Cyperus difformis Hanalei District, taro paddies at Hanalei National Wildlife Refuge Growing in water and along margins of paddies. Preserved_Specimen Clumped perennial. Wagner, W.L. 6346 Kauai BISH 1990-06-11
6 Cyperus difformis Kaimuki Preserved_Specimen Forbes, C.N. 2361 Oahu BISH 1916-03-26
7 Cyperus difformis Honolulu, Waikahululu, Nuuanu Stream, at School Street Bridge Rare in wet cement bed of stream. Preserved_Specimen Fosberg, F.R. 27096 Oahu BISH 1946-09-22
8 Cyperus difformis Honolulu, Nu'uanu, Ekekela Pl Crack between road and curb. Moist due to a leaking pipe in area which is providing a steady flow of water Preserved_Specimen Only found in this area from the wet area Faccenda, K. 1973 Oahu BISH 2021-06-12
9 Cyperus difformis East Maui, Hana Hwy, Huelo Lowland disturbed wet roadside, in puddle. Substrate wet earth. Associated vegetation: Psidium guajava. Preserved_Specimen Erect sedge, less than 1/2m ht. Starr, F. 308073 Maui BISH 2003-08-07
10 Cyperus difformis Lawai valley, PTBG along the Lawai Stream Preserved_Specimen Flynn, T.W. 618 Kauai BISH 1983-10-03
11 Cyperus difformis Kawainui Air Park, Kapaa Quarry Rd Common in oopen field & roadside, full sun, moist to dry substrate. Preserved_Specimen Herbaceous erect to decumbent grass 0.5 m ht. O'Connor, P.J. Oahu BISH 1987-05-09
12 Cyperus difformis Honolulu District, UH campus, in taro patch across from Faculty Apts on Dole St In taro patch. Preserved_Specimen Herbst, D.R. 415 Oahu BISH 1967-04-10
13 Cyperus difformis W Maui, Lahaina District, Kuia, mauka of Wainee Growing in muddy ground from a leaky reservoir in old sugarcane field. Preserved_Specimen Oppenheimer, H.L. 40107 Maui BISH 2001-04-08
14 Cyperus difformis Hanalei National Wildlife Refuge, B Ponds Moist soil impoundment, growing with mixed annuals, growing in moist soil. Preserved_Specimen Uyehara, K.J. Kauai BISH 2002-07-23
15 Cyperus difformis W Maui, Lahaina District, Ukumehame Valley Scattered throughout taro loi. Preserved_Specimen Starr, F. 9907241 Maui BISH 1999-07-24
16 Cyperus difformis Pauoa Preserved_Specimen Heller, A.A. Oahu BISH 1895-03-26
17 Cyperus difformis Makaha Valley, Reservoir Preserved_Specimen Hosaka, E.Y. 4216 Oahu BISH 1936-06-17
18 Cyperus difformis Pauoa Preserved_Specimen Heller, A.A. 2469 Oahu BISH 1895-03-26
19 Cyperus difformis Makaha Valley, Reservoir Preserved_Specimen Hosaka, E.Y. 4216 Oahu BISH 1936-06-17
20 Cyperus difformis Nuuanu Valley Preserved_Specimen Forbes, C.N. Oahu BISH 1909-06-13
21 Cyperus difformis Waianae Preserved_Specimen Hosaka, E.Y. Oahu BISH 1936-06-17
22 Cyperus difformis Pauoa Preserved_Specimen Heller, A.A. Oahu BISH 1895-03-26
23 Cyperus difformis Pauoa Preserved_Specimen Heller, A.A. Oahu BISH 1895-03-26
24 Cyperus difformis Kailua; edge of Kaelepulu Pond; north & west borders Preserved_Specimen Neal, M.C. Oahu BISH 1940-05-30
25 Cyperus difformis Honolulu, Vineyard St, near Bishop Museum, Chinese vegetable garden Preserved_Specimen Wilder, G.P. Oahu BISH 1930-11-20
26 Cyperus difformis Koolaupoko District, Waiahole Beach Park on Kaneohe Bay Preserved_Specimen Herbst, D.R. 511 Oahu BISH 1967-06-17
27 Cyperus difformis Behind PMRF along cane rd to Polihale Beach State Park Low, seepy area. Preserved_Specimen Flynn, T.W. 867 Kauai BISH 1984-05-30
28 Cyperus difformis Waialua Beach Road, Waialua, private lotus farm Small sedge growing in wet mud on pond banks. Preserved_Specimen Imada, C. 9232 Oahu BISH 1992-04-05
29 Cyperus difformis Moanalua Stream, Honolulu; adjacent to Moanalua Gardens Growing in stream and along stream banks Preserved_Specimen Annual, cespitose, ca. 35-45 cm tall. ca. 10-20 plants seen. Ross, M.C. 1962 Oahu BISH 2023-09-22
30 Cyperus difformis Kawaihau District. Private lands behind Coco Palms, parcel on Makai side of Koki Road. Low depression covered with Bacopa, surrounding by secondary lowland forest of Java Plam and Macaranga tanarius and piles of cut green waste and assorted rubbish. Syzygium cumini, Macaranga tanarius, Megathyrsus maximus, Eclipta prostrata, Leucaena leucocephala, Pluchea indica, P. carolinensis, Amaranthus spinosus, Ipomoea triloba, Solanum torvum, Cyperus spp., Preserved_Specimen Green culms to around 30 cm. tall, sharply trigorinous, roots fibrous, shallow. Plant is occasional, forming small clumps throughout mud flat covered in Bacopa in full sun. Williams, A.M. 831 Kauai BISH 2023-09-26
31 Cyperus difformis S shore, Kapalawai, makai of Hwy 50 Growing in grassy wetland along with Cynodon, Cuphea, Ludwigia, Senna, Kyllinga, Commelina, Cyperus involucratus. Preserved_Specimen Sedge 6-8 in. tall Imada, C. 998 Kauai BISH 1999-03-06
32 Cyperus difformis West Maui, Kahului. Along Hana Highway In small drainage. Preserved_Specimen Naturalized. Oppenheimer, H.L. 60922 Maui BISH 2009-06-29
33 Cyperus difformis Mauka side of Kamehameha Highway; ca. 0.25 mile from Heeia Point Growing in a low scraped area on the ground. Preserved_Specimen Funk, E.J. Oahu BISH 1989-11-08
34 Cyperus difformis Near Hanapepe Falls Wet sunny roadside. Preserved_Specimen Degener, O. 2230 Kauai BISH 1926-06-19
35 Cyperus difformis Kahuku Training Area, road survey. Roadside vegetation. Preserved_Specimen Naturalized; ca 5 plants. Kawelo, K. 511 Oahu BISH 2019-03-18
36 Cyperus difformis Koloa District; Lawai Valley. the National Tropical Botanical Garden. Secondary vegetation along drainage between Medicinal and Cycad Areas, saturated ground. Preserved_Specimen Roots reddish or white, base of stem pale whitish-green, stems and bracts dk glossy green except pale green at junction; inflor. pale green tinged brownish. Flynn, T.W. 5757 Kauai BISH 1995-04-07
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