Pacific Island Ecosystems at Risk (PIER)

  [   PIER species lists  ]   [   PIER home  ]

Elytraria imbricata
R. Br., Acanthaceae
Click on an image for links to BIGGER PICTURES


Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Other Latin names:  Elytraria tridentata Vahl; Justicia imbricata Vahl

Common name(s): [more details]

English: purple scalystem

Habit:  herb

Description:  "Acaulescent, or if caulescent the leaves crowded at tips of glabrous or sparingly pilosulous stems to 60 cm long; leaf blades ovate to oblong or obovate, rarely linear-lanceolate, 1-18 cm long, 0.5-6 cm wide, blunt or subacute at apex, narrowed at base to a slender winged petiole, both surfaces appressed-pilose or glabrate, margins undulate; scapes numerous, axillary, 1-24 cm long, simple or branched (sometimes leafy at tip), covered by tightly appressed ovate to subulate scales; spikes 1 to several, to 6 cm long; bracts oblong or elliptic; 3-6 mm long, 1-2 mm wide, firm, awn-tipped and bearing a pair of triangular or rhombic hyaline teeth near apex; bractlets 3 mm long; calyx segments thin, the upper bidentate; corolla blue to lavender-purple, 5-8 mm long; capsule oblong, glabrous"  (Wiggins & Porter, 1971; p. 264).

Habitat/ecology:  "Usually growing on bushy slopes, in thickets, and in shrubby forests at low elevations" (Wiggins & Porter, 1971; p. 264).

Propagation:  Seed

Native range:  Southern USA, Mexico, Central and South America (GRIN).

Presence:

Pacific
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Ecuador (Galápagos Islands)
Isabela Group
Isabela Island introduced
invasive
Charles Darwin Foundation (2008)
Observed in survey, no herbarium record.
Ecuador (Galápagos Islands)
Santa Cruz Group
Santa Cruz Island introduced
invasive
Charles Darwin Foundation (2008)
Philippines
Philippine Islands
Philippine Islands introduced
invasive
Merrill, Elmer D. (1923) (p. 468)
In open waste places, dry thickets, etc., in and about towns at low altitudes.
Pacific Rim
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Colombia
Colombia
Colombia (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Costa Rica
Costa Rica
Costa Rica (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Ecuador (Mainland)
Ecuador
Ecuador (Republic of) (continental) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
El Salvador
El Salvador
El Salvador (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Guatemala
Guatemala
Guatemala (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Honduras
Honduras
Honduras (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Mexico
Mexico
Mexico (United Mexican States) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Nicaragua
Nicaragua
Nicaragua (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Panama
Panama
Panama (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Perú
Perú
Perú (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Also reported from
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
United States (continental except west coast)
United States (other states)
United States (other states) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Arizona, Texas

Comments:  Probably not native to the Galápagos Islands, possibly introduced, per Charles Darwin Research Station.


Need more info? Have questions? Comments? Information to contribute? Contact PIER! (pier@hear.org)

  [   PIER species lists  ]   [   PIER home  ]

This page was created on 6 JUL 2004 and was last updated on 24 APR 2013.