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Urena lobata

L. (1753)

This name is accepted

Kingdom: Viridiplantae Phylum: Magnoliophyta Class/Clade: Eudicot-Rosids Order: Malvales Family: Malvaceae Genus: Urena

aramina, bur mallow, pink burr

Description

Key Characters:

Growth Form: Erect or diffuse subshrubs 0.5-2 m tall, pubescence various, the hairs stellate and sometimes simple.

Stems: Branches often tinged purple, closely stellate and sometimes also simple pubescent.

Roots:

Leaves: Leaves simple. Alternate. Blades ovate to transverse-elliptic, 2-10 cm wide, unlobed or 3-angled, 5-angled, or 7-angled or lobed. Base truncate to cordate or cuneate. Lower surfaces with a bordered gland on midrib and sometimes adjacent adjacent veins near base. Margins serrate to crenate. Petioles usually shorter than blades. Stipules obscure, caducous.

Flowers: Flowers solitary or glomerate in the leaf axils or in spicate or racemose inflorescences by reduction of upper leaves, pedicels 0.2-0.4(-0.6) cm long, not articulate; involucral bracts 5, 4-7 mm long, linear-subulate to narrowly oblong, connate basally, alternate with the 5 calyx lobes. Flowers bisexual (perfect). Calyx tubular to campanulate, composed of connate sepals, (3-)5-toothed or (3-)5-lobed, sometimes irregularly cleft or truncate, 4-6 mm long, the lobes valvate in bud. Corolla actinomorphic to moderately zygomorphic, tubular to rotate, the corolla of 5 petals, pink to purplish pink, maroon at base, drying lavendar, 1-1.5 cm long, obovate, distinct from each other but adnate at base to staminal column, convolute in bud. Stamens 5 to numerous, monadelphous, staminal column prominent, slightly deflexed, 1-1.5 cm long; anthers in upper 1/2; filaments terminating the staminal column or borne below a 5-dentate apex; anthers monothecal; anthers and stigmas dark purple. Pollen globose, echinate. Ovary superior, carpels 5, the carpels borne in a single whorl or rarely seemingly superposed whorls, placentation axile; ovules 1 per carpel, ascending; style branches 10, exceeding the staminal column; stigmas capitate.

Fruit: Schizocarps; mericarps 5; 4-5 mm long; trigonous; stellate pubescent and reticulate-veined; usually strongly glochidiate apically and dorsally; ca 1 mm long; indehiscent. Seeds 2.5-3.5 mm long; brown; reniform; glabrous or puberulent; with or without endosperm.

Ploidy: 2n = 14; 28; 56

Habitat: Naturalized in low elevation disturbed areas.

Elevation Range: 20–30 m.

Historical Distribution

Uses and Culture

USES

Natural History

Statewide Status

Naturalized

Island Status

Kaua'i Naturalized
O'ahu Naturalized
Maui Naturalized

Dispersal Agents

Water/Ocean
Other Animals

Pollinators

Notes

  • Description digitized by Ashley wilson
  • Description digitized from the Manual of the Flowering Plants of Hawaii
  • The elevation range of Urena lobata is 20-30 m.
  • Urena lobata is an erect or diffuse shrub and is about 0.5-2 m tall. Further Urena lobata has often tangled purple branches that are closely stellate and sometimes also simple pubescent. Additionally, the pedicles of Urena lobata grow to be about 0.2-0.6 cm long. Also the anthers and stigmas are dark purple. Lastly, Urena lobata was first noted by Nelson.

Bibliography

Name Published In: Sp. Pl.: 692 (1753)

Other References

Wagner et al. 1990:903 (K, O, EM); Staples & Herbst 2005:383 (KEY), 393 (DESCR)

Occurrences

SNo. Scientific Name Scientific Name Authorship Locality Habitat Basis of Record Recorded By Record Number Island Source Date
1 Urena lobata L. east maui, keanae valley, along the valley road just inside the forest reservoir boundary Rare in wooded gully. PRESERVED_SPECIMEN hobdy, r.w. collector number: 2659 Oahu BISH 12/30/1986
2 Urena lobata L. lawai. intersection of waha and lauoho roads PRESERVED_SPECIMEN flynn, t. collector number: 660 Kauai BISH 11/23/1983
3 Urena lobata L. punaluu Cane field. PRESERVED_SPECIMEN nakagawa, s. Oahu BISH 10/28/1930
4 Urena lobata L. site: a9-40 near trees 8, 9 (orig.) From trees planted by D.T. Fleming along Pu'u Kukui Trail. PRESERVED_SPECIMEN nagata, k.m. collector number: 147 Maui BISH 8/8/1966
5 Urena lobata L. along waioli valley road, waioli PRESERVED_SPECIMEN funk, e.j. collector number: s.n. Hawaii BISH 10/27/1989
6 Urena lobata L. honolulu; manoa, luaalaea; koa forest PRESERVED_SPECIMEN anon. collector number: s.n. Oahu BISH 5/1/1936
7 Urena lobata L. East Maui, Keanae Valley, Along the valley road just inside the forest reservoir boundary PRESERVED_SPECIMEN Hobdy, R.W. 2659 Maui BISH 12/30/1986
8 Urena lobata L. cultiv. college of hawaii greenhouse PRESERVED_SPECIMEN anon. collector number: 1916 Oahu BISH 9/16/1916
9 Urena lobata L. Punaluu Cane field. PRESERVED_SPECIMEN Nakagawa, S. s.n. Oahu BISH 10/28/1930
10 Urena lobata L. Punaluu Valley. At bottom of Pig-God Trail Wet roadside under mountain apple trees. PRESERVED_SPECIMEN Degener, O. 7127 Oahu BISH 8/11/1931
11 Urena lobata L. waiahole valley, koolaupoko Uncommon in fallow agricultural fields along north fork Waiahole Valley Rd. Growing with Mimosa pudica, Phyllanthus debilis, etc. PRESERVED_SPECIMEN nagata, k.m. collector number: 2392 Oahu BISH 12/12/1981
12 Urena lobata L. kahana valley project. along jeep trail on the kawa side of the valley. pass the main gate and the marshy area PRESERVED_SPECIMEN herat, t. wirawan, n. collector number: 157 Oahu BISH 8/14/1972
13 Urena lobata L. Waiahole Valley, Koolaupoko Uncommon in fallow agricultural fields along north fork Waiahole Valley Rd. Growing with Mimosa pudica, Phyllanthus debilis, etc. PRESERVED_SPECIMEN Nagata, K.M. 2392 Oahu BISH 12/12/1981
14 Urena lobata L. Near bottom of Pig-God Trail, Punaluu Valley PRESERVED_SPECIMEN Degener, O.; Park, K. K. 7126 Oahu US 8/5/1931
15 Urena lobata L. Lawai. Intersection of Waha and Lauoho roads. PRESERVED_SPECIMEN Tim Flynn 660 Kauai PTBG 11/23/1983
16 Urena lobata L. Keanae Valley, sparingly naturalized (for over 10 years.) along the valley road just inside the forest reservoir boundry. PRESERVED_SPECIMEN Bob Hobdy 2659 Maui PTBG 12/30/1986
17 Urena lobata L. Kahana, Kualoa Ranch, Kaaawa Valley Road. Plot 9082. US Forest Service Pacific Forest Inventory and Analysis. Open pature. Mostly grass w/ scattered shrubs and sedges. PRESERVED_SPECIMEN Natalia Tangalin 2265 Oahu PTBG 1/27/2010
18 Urena lobata L. Puu Ka Pele Forest Reserve, contour road between Kaaweke and Polihale ridges. Ruderal vegetation of Paspalum, Setaria, and Emilia. PRESERVED_SPECIMEN Tim Flynn 6122 Kauai PTBG 4/2/1997
19 Urena lobata L. near bottom of pig-god trail, punaluu valley PRESERVED_SPECIMEN o. degener & k. park 7126 Oahu US 8/5/1931
20 Urena lobata L. Honolulu; Manoa, Luaalaea; Koa forest PRESERVED_SPECIMEN Anon. s.n. Oahu BISH 5/1/1936
21 Urena lobata L. Lawai. Intersection of Waha and Lauoho roads PRESERVED_SPECIMEN Flynn, T. 660 Kauai BISH 11/23/1983
22 Urena lobata L. Site: A9-40 near trees 8, 9 (orig.) PRESERVED_SPECIMEN Nagata, K.M. 147 Oahu BISH 8/8/1966
23 Urena lobata L. along Waioli Valley Road, Waioli PRESERVED_SPECIMEN Funk, E.J. s.n. Kauai BISH 10/27/1989
24 Urena lobata L. Cultiv. College of Hawaii Greenhouse PRESERVED_SPECIMEN Anon. 1916 Oahu BISH 9/16/1916
25 Urena lobata L. Kahana Valley Project. Along jeep trail on the Kawa side of the valley. Pass the main gate and the marshy area PRESERVED_SPECIMEN Herat, T. 157 Oahu BISH 8/14/1972
26 Urena lobata L. punaluu valley. at bottom of pig-god trail Wet roadside under mountain apple trees. PRESERVED_SPECIMEN degener, o. park, k.k. collector number: 7127 Oahu BISH 8/11/1931
27 Urena lobata L. waiahole trail PRESERVED_SPECIMEN kerr, m. collector number: s.n. Oahu BISH 8/18/1946
28 Urena lobata L. punaluu valley; near bottom of pig-god trail Wet roadside under mountain-apple trees. PRESERVED_SPECIMEN degener, o. park, k.k. collector number: 7126 Oahu BISH 8/5/1931
29 Urena lobata L. Oahu Windward side Oahu near beach. PRESERVED_SPECIMEN Caum, E.L. 1315 Oahu BISH 10/1/1924
30 Urena lobata L. Punaluu Valley; near bottom of Pig-God Trail Wet roadside under mountain-apple trees. PRESERVED_SPECIMEN Degener, O. 7126 Oahu BISH 8/5/1931
31 Urena lobata L. oahu Windward side Oahu near beach. PRESERVED_SPECIMEN caum, e.l. brown, b.f. collector number: 1315 Oahu BISH 10/1/1924
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