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Ageratum houstonianum

Mill. (1768)

This name is accepted

Kingdom: Viridiplantae Phylum: Magnoliophyta Class/Clade: Eudicot-Asterids Order: Asterales Family: Asteraceae Genus: Ageratum

ageratum, maile hohono, maile honohono, maile kula

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Description

Key Characters:

Growth Form:

Stems:

Roots: Root system includes adventitious roots and rooting at nodes.

Leaves: Leaves simple. Opposite. Blades cordate, deltate, elliptic, ovate, or rhombic Apex acute. Base cordate, runcate, or rarely rounded. Margins crenate.

Flowers:

Fruit:

Ploidy:

Habitat:

Elevation Range:

Historical Distribution

Images

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Uses and Culture

USES

  • Yes

Natural History

Statewide Status

Naturalized

Island Status

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

Dispersal Agents


Pollinators

Bibliography

Name Published In: Gard. Dict. ed. 8: n.° 2 (1768)

Other References

Wagner et al. 1990:256 (K, O, H); Oppenheimer & Bartlett 2000:2 (EM); Staples & Herbst 2005:153 (DESCR)

Occurrences

SNo. Scientific Name Locality Habitat Basis of Record Description Recorded By Record Number Island Source Date
1 Ageratum houstonianum Volcano Road, just below Olaa Abundant on cindery road-cut in lava flow. Preserved_Specimen Much branched herb, flowers pale blue-violet. Fosberg, F.R. 55647 Hawaii BISH 1975-03-14
2 Ageratum houstonianum Kahana Valley pasture Preserved_Specimen to 0.5 m; flower lavender Annable, C.R. 3095 Oahu BISH 1996-10-30
3 Ageratum houstonianum Manoa Valley, Honolulu In wet soil in gutter. Preserved_Specimen Weed. Fosberg, F.R. 13832 Oahu BISH 1937-05-22
4 Ageratum houstonianum East Maui, Hana District, Nahiku, along Nahiku Road North of Hana Hwy Common weed along road. Preserved_Specimen Oppenheimer, H.L. 69910 Maui BISH 1999-06-13
5 Ageratum houstonianum Keauhou Ranch, (near T-KH), Kau district Side of skid trail, in disturbed Metrosideros-Acacia koa forest. Preserved_Specimen Herb 2-3 ft tall, flowers lavendar colored. Cuddihy, L.W. 19 Hawaii BISH 1979-10-25
6 Ageratum houstonianum Kalihi Kai, City/County beach road Wet area with Erechtites, Emelia, Sonchus & Pennisetum purpureum. Preserved_Specimen Funk, E.J. 705 Kauai BISH 1990-05-03
7 Ageratum houstonianum 1/4 mile before end of road at Haena Beach Along side of road. Preserved_Specimen Weed. Corn, C. Kauai BISH 1978-06-16
8 Ageratum houstonianum ahupuaa of Halepuaa in the Puna District of Hawaii The plant is common growing on the side of the road. The area is exposed to moderate sunlight. Preserved_Specimen Kubo, R. 6 Hawaii BISH 1979-03-07
9 Ageratum houstonianum Off Railroad Ave. in Lower Nanawale Forest Reserve Roadside vegetation. Associated with Brachiaria, Arundina, and Rubus. Occurs in full sun. Common in disturbed areas in Nanawale. Preserved_Specimen Plant .5 m tall. Purple flower. Croft, L.K. 790024 Hawaii BISH 1979-02-02
10 Ageratum houstonianum Morgan Toledo Taro Farm, Waipio Valley, Big Island, Hawaii Growing on streambank at the backside of the property. Preserved_Specimen Erect herb, purple pom-pom-like flowers in cymes. Crago, L.M. 2005105 Hawaii BISH 2005-03-19
11 Ageratum houstonianum Honolulu; Nuuanu Valley Roadside Preserved_Specimen Flowers lavender. Fosberg, F.R. 14004 Oahu BISH 1937-06-06
12 Ageratum houstonianum Napali Coast, Haena Point Common along road Preserved_Specimen Procumbent stems rooting at nodes. Flowering branches ascending, heads lavender Fosberg, F.R. 56702 Kauai BISH 1977-03-12
13 Ageratum houstonianum Hualalai (Olma Tract; Kaloka Mauka) Ohia-fern mesic forest. Preserved_Specimen Engilis Jr., A. 23 Hawaii BISH 1987-08-17
14 Ageratum houstonianum End Hanalei Road. Wet Cave parking Forming part of undergrowth to Syzygium-Psidium forest. Preserved_Specimen Small trailing weed tp 0.3 m. Leaves cordate, tomentose beneath to hirsute on tip. Flower blue with heads up to 7 mm in diameter. Spence, G. 153 Kauai BISH 1973-04-13
15 Ageratum houstonianum Ridge east of Hanalei Valley Abundant on roadside Preserved_Specimen Erect, aromatic. Flowers bright lavender-purple Fosberg, F.R. 41478 Kauai BISH 1961-03-12
16 Ageratum houstonianum Near Kalihiwai Reservoir In abandoned land. Preserved_Specimen Corn, C. 8210 Kauai BISH 1982-04-30
17 Ageratum houstonianum Honolulu; Woodlawn, Manoa Valley In weed-filled vacant lot Preserved_Specimen Herbage with slight odor. Flowers lavender. Fosberg, F.R. 13835 Oahu BISH 1937-05-22
18 Ageratum houstonianum South Hilo District Along saddle road ca. 17 km from Hilo, just before the forest reserve Preserved_Specimen Ca. 0.3 m tall; flowers small Herat, T. 700 Hawaii BISH 1974-06-22
19 Ageratum houstonianum Hawaii Kai, Allen Davis Beach, along the gravel/dirt parking area. Growing with Scaevola taccada, Coccoloba uvifera, Dactyloctenium aegyptium, Verbesina encelioides. Preserved_Specimen Herb. Kennedy, B. 55 Oahu BISH 2018-04-07
20 Ageratum houstonianum Kalihi Valley Roadside Preserved_Specimen Garber, D.W. 95 Oahu BISH 1920-01-01
21 Ageratum houstonianum Kilauea, Hawaii National Park Park residence area Preserved_Specimen Composite 4 ft. high; Flowers light blue Fagerlund, G.O. 226 Hawaii BISH 1942-12-01
22 Ageratum houstonianum Honolulu; V. H. Duker garden Preserved_Specimen Flowers blue-lavender Fosberg, F.R. 8368 Oahu BISH 1933-04-01
23 Ageratum houstonianum Hilo suburb Preserved_Specimen Degener, O. 30793 Hawaii BISH 1966-05-10
24 Ageratum houstonianum Stainback Highway, Near junction with Highway 11 Preserved_Specimen Herb, about 3 ft. tall. Flowers lavender. Herbst, D.R. 927 Hawaii BISH 1968-02-16
25 Ageratum houstonianum Kailua; Koolau Farmers Preserved_Specimen Vigorous plants 10 tall, roots proliferous from,lower nodes. Flowers fragrant, heads pure white Staples, G.W. 959 Oahu BISH 1994-09-23
26 Ageratum houstonianum Stainback Highway, Near junction with Highway 11 Preserved_Specimen Herb, about 3 ft. tall. Flowers lavender. Herbst, D.R. 927 Hawaii BISH 1968-02-16
27 Ageratum houstonianum Keauhou Ranch, along jeep road Preserved_Specimen Herb. Height 2', area 3' x 3'. Flowers lavender. Davis, J. 307 Hawaii BISH 1980-06-25
28 Ageratum houstonianum Honolulu Preserved_Specimen Flowers blue. St.John, H. 10502 Oahu BISH 1930-04-27
29 Ageratum houstonianum Near Volcano House Preserved_Specimen Herb about 2 ft. tall Newell, C.L. 139 Hawaii BISH 1966-07-22
30 Ageratum houstonianum Stainback Highway, Near junction with Highway 11 Preserved_Specimen Herb, about 3 ft. tall. Flowers lavender. Herbst, D.R. 927 Hawaii BISH 1968-02-16
31 Ageratum houstonianum Koloa District, Poipu. National Botanical Garden Visitor's Center. Cultivated plants in bedding display Preserved_Specimen Clumping or mound-forming herb of 1.5 ft.; stems glossy pale green to reddish; leaves rugose, medium dull green above, dull paler below; corolla dark lavender. Flynn, T.W. 6735 Kauai BISH 2000-09-12
32 Ageratum houstonianum Tantalus; Round Top Drive, upper portion Preserved_Specimen Plants to 1.5 ft. tall. Leaves cordate; flowering heads to 7 mm across with bracts sticky & hairy. Spence, G. 378 Oahu BISH 1976-06-01
33 Ageratum houstonianum Puna District; Lower Nanawale Forest Reserve On side of dirt road, common Preserved_Specimen Yoshida, L. 179.024 Hawaii BISH 1979-02-22
34 Ageratum houstonianum Kokee: in garden Preserved_Specimen Plews, J.H.R. Kauai BISH 1987-04-10
35 Ageratum houstonianum Kokee. Camp 10 Road Garden of Plew's Residence Preserved_Specimen Plews, J.H.R. Kauai BISH 1986-10-23
36 Ageratum houstonianum Princeville at Hanalei Roadside lookout onto Hanalei National Wildlife Refuge Preserved_Specimen Wagner, W.L. 5171 Kauai BISH 1983-12-21
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