Heterotis rotundifolia

(Sm.) Jacq.-Fél. (1981)

This name is accepted

Kingdom: Viridiplantae Phylum: Magnoliophyta Class/Clade: Eudicot-Rosids Order: Myrtales Family: Melastomataceae Genus: Heterotis

dissotis

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Description

Key Characters:

Growth Form: Decumbent herbs.

Stems: Stems rooting at the nodes, up to 20 cm or more long, moderately hirtellous to pilose.

Roots:

Leaves: Leaves simple. Opposite, decussate. Blades ovate to ovate–lanceolate or suborbicular, 1.5–7 cm long, 0.8–4 cm wide. Apex acute. Base truncate to short-attenuate. Surfaces sparsely to densely pilose. Margins ciliate and somewhat crenulate. 3-veined. Petioles 0.5–2.5 cm long. Stipules absent.

Flowers: Flowers in mostly solitary or 2, terminal, pedicels ca. 2 mm long in fruit. Flowers bisexual (perfect). Hypanthium terete (cylindrical), 5–7 mm long in flower, densely covered with green, spreading, hair-like, linear–oblong appendages 2–4 mm long, apex stellate and sparsely to moderately bristly along their length; fruiting hypanthium cylindrical-campanulate, ca. 1 cm long, ca. 0.9 cm wide. Calyx lobes lanceolate in fruit, persistent, 5–6.5 mm long, 1.5–2 mm wide at base, bristly at apex and externally. Corolla of 5 petals, obovate, ca. 20 mm long, ca. 15 mm wide. Stamens 10, markedly dimorphic; anthers linear, with ventrally inclined pores, connective of larger anthers prolonged ventrally at base of anther and modified into a 2-lobed appendage at junction with filament, connective of smaller anthers barely developed ventrally; anthers of larger Stamens pink or lavender, 7–8 mm long, connective prolonged 3–4 mm and modified basally into a deeply 2-lobed spur 1.5–2 mm long; anthers of smaller Stamens yellow, 5.5–7 mm long, connective prolonged 0.5 mm or less with a 2-lobed spur usually 0.5 mm long. Ovary inferior, distinct along the distal ½ but adnate at base to inner hypanthial wall by 8–10 septa, 5-celled, apex bristly, placentation axile; ovules numerous; style simple and terminated by a punctiform to capitate stigma.

Fruit: Capsules coriaceous; enclosed by the hypanthium at maturity. Seeds numerous; cochleate; ca. 1 mm long; prominently ribbed dorsally with a deep pit on each side; endosperm absent.

Ploidy: 2n = 30

Habitat:

Elevation Range:

Historical Distribution

Images

Uses and Culture

USES

Natural History

Statewide Status

Naturalized

Island Status

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

Dispersal Agents


Vegetative Reproduction

Pollinators

Bibliography

Name Published In: Adansonia, sér. 2, 20(4): 417 (1981)

Other References

Wagner et al. 1990:907 (O, M, H [as Dissotis rotundifolia]); Herbarium Pacificum Staff 1996:5 (K); Staples & Herbst 2005:394 (KEY), 395 (DESCR); Almeda 2009:233 (Syn. D. rotundifolia = H. rotundifolia)

Occurrences

SNo. Scientific Name Locality Habitat Basis of Record Recorded By Record Number Island Source Date
1 Heterotis rotundifolia Kaneohe; Luluku Sunny roadside, growing over hillside close to stream in direct sun, with grass covering entire slope. Common in assoc. with grasses, but this plant dominates at edge of the road. Preserved_Specimen McConnell, K. Oahu BISH 1991-12-04
2 Heterotis rotundifolia Hilo; Near Hilo Bay In yard of abandoned house. Preserved_Specimen Herbst, D.R. 5511 Hawaii BISH 1975-10-20
3 Heterotis rotundifolia Kona District, Manoa Lyon Arboretum: Intersection of the main Jeep trail and the Seismograph station near trail near trail marker 5A. Preserved_Specimen Dunn, L. 560 Oahu BISH 2014-01-24
4 Heterotis rotundifolia Kawaihau District. Wailua Homesteads top of Olohena, Moalepe Trail, in fallow pasture. Fallow Cow pasture W/ Non-native grasses, Mangifera indica, Psidium cattleianum, Nephrolepis, Chrysophyllum oliviforme, Lantana, weedy Euphorbia. Preserved_Specimen Tangalin, N. 5144 Kauai BISH 2021-03-23
5 Heterotis rotundifolia 2922 Oahu Ave, Manoa Valley Growing at base of hedge in yard. Shady wet location under roof line. Preserved_Specimen Fujikawa, K. Oahu BISH 1989-02-22
6 Heterotis rotundifolia Wailua, Wailua Homesteads, on Opaekaa Rd, just past Olu Lane on E side of street in an empty lot and along roadside W/ Citharexylum, Triumfetta semitriloba, Hyptis, Psidium cattleianum, Ficus lyrata, Spahtodea campanulata, Stachytarpheta Preserved_Specimen Tangalin, N. 1284 Kauai BISH 2007-05-28
7 Heterotis rotundifolia Puhi Camp, W of Kauai Community College From yard of abandoned homesite. Preserved_Specimen Flynn, T.W. 1644 Kauai BISH 1986-04-04
8 Heterotis rotundifolia Nuuanu area, 2616 Pali Hwy Growing in dappled shade. Preserved_Specimen Lau, J. 1621 Oahu BISH 1985-11-16
9 Heterotis rotundifolia Waialua District, Kauwalu Gulch. Preserved_Specimen Oppenheimer, H.L. 70919 Oahu BISH 2009-07-22
10 Heterotis rotundifolia Honolulu: Manoa Valley; H. L. Lyon Arboretum Preserved_Specimen Nagata, K.M. 399 Oahu BISH 1968-06-05
11 Heterotis rotundifolia Puna; 1 km W on Pakaka Road Preserved_Specimen Annable, C.R. 3756 Hawaii BISH 1998-01-18
12 Heterotis rotundifolia Foster Gardens Preserved_Specimen Potter, C. Oahu BISH 1960-01-18
13 Heterotis rotundifolia Foster Gardens Preserved_Specimen Potter, C. Oahu BISH 1958-08-25
14 Heterotis rotundifolia 2357B Palolo Ave Preserved_Specimen Suenaga, B. Oahu BISH 1985-07-01
15 Heterotis rotundifolia Kawaihau Dist. Near beginning of proposed Wailua Cart Trail Preserved_Specimen Flynn, T.W. 4885 Kauai BISH 1992-01-28