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Publication #ENH-693

Ptychosperma macarthurii: Macarthur Palm1

Edward F. Gilman and Dennis G. Watson2

Introduction

This attractive small palm is noted for its multiple, slim, ringed grey trunks which are topped with soft green, feathery, flat, broad leaves with tips that appear jagged and torn. Although able to reach 30 feet in height, Macarthur Palm is most often seen 10 to 15 feet in height with a variable spread. The two-foot-long, branched flower stalks hang below the crownshaft throughout the year and contain small, white blooms. These blooms give way to bright red, showy sprays of half-inch-long fruits which ripen year-round.

Figure 1. 

Middle-aged Ptychosperma macarthurii: Macarthur Palm


[Click thumbnail to enlarge.]

General Information

Scientific name: Ptychosperma macarthurii
Pronunciation: tye-koe-SPER-muh mack-ar-THUR-ee-eye
Common name(s): Macarthur Palm
Family: Arecaceae
USDA hardiness zones: 10B through 11 (Fig. 2)
Origin: not native to North America
Invasive potential: little invasive potential
Uses: indoors; deck or patio; specimen; container or planter
Availability: not native to North America

Figure 2. 

Range


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Description

Height: 15 to 25 feet
Spread: 6 to 10 feet
Crown uniformity: irregular
Crown shape: palm, upright/erect
Crown density: open
Growth rate: moderate
Texture: medium

Foliage

Leaf arrangement: spiral (Fig. 3)
Leaf type: odd-pinnately compound
Leaf margin: entire, incised
Leaf shape: obovate, oblong, linear
Leaf venation: parallel
Leaf type and persistence: evergreen
Leaf blade length: 8 to 12 inches
Leaf color: green
Fall color: no color change
Fall characteristic: not showy

Flower

Flower color: white/cream/gray
Flower characteristics: not showy

Fruit

Fruit shape: round, oval
Fruit length: .5 to 1 inch
Fruit covering: fleshy
Fruit color: red
Fruit characteristics: does not attract wildlife; showy; fruit/leaves not a litter problem

Trunk and Branches

Trunk/bark/branches: branches don't droop; showy; typically multi-trunked; thorns
Pruning requirement: little required
Breakage: resistant
Current year twig color: not applicable
Current year twig thickness:
Wood specific gravity: unknown

Culture

Light requirement: full sun, partial sun or partial shade, shade tolerant
Soil tolerances: clay; sand; loam; slightly alkaline; acidic; well-drained
Drought tolerance: high
Aerosol salt tolerance: low

Other

Roots: not a problem
Winter interest: no
Outstanding tree: no
Ozone sensitivity: unknown
Verticillium wilt susceptibility: resistant
Pest resistance: resistant to pests/diseases

Figure 3. 

Foliage


[Click thumbnail to enlarge.]

Use and Management

Macarthur Palm is often used in planters or urns but quickly outgrows these containers. It makes a striking lighted nighttime specimen, and is ideal for accenting shaded, sheltered locations, such as entranceways and patios. It is often planted in groups with individual trees several feet apart.

Macarthur Palm prefers partial shade but will tolerate full sun or dense shade on any well-drained soil. Abundant moisture will allow it to look its best because it will keep more leaves.

Propagation is by seed.

Pests and Diseases

No pests or diseases are of major concern. This palm is lethal yellowing-resistant. Sooty mold sometimes coats the trunk.

Footnotes

1.

This document is ENH-693, one of a series of the Environmental Horticulture, Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida. Original publication date November 1993. Revised December 2006. Reviewed May 2011. Visit the EDIS website at http://edis.ifas.ufl.edu.

2.

Edward F. Gilman, professor, Environmental Horticulture Department; Dennis G. Watson, former associate professor, Agricultural Engineering Department, Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida, Gainesville, FL 32611.


The Institute of Food and Agricultural Sciences (IFAS) is an Equal Opportunity Institution authorized to provide research, educational information and other services only to individuals and institutions that function with non-discrimination with respect to race, creed, color, religion, age, disability, sex, sexual orientation, marital status, national origin, political opinions or affiliations. For more information on obtaining other UF/IFAS Extension publications, contact your county's UF/IFAS Extension office.

U.S. Department of Agriculture, UF/IFAS Extension Service, University of Florida, IFAS, Florida A & M University Cooperative Extension Program, and Boards of County Commissioners Cooperating. Nick T. Place, dean for UF/IFAS Extension.