Opuntia triacantha

(Willdenow) Sweet

Hort. Brit., 172. 1826.

Basionym: Cactus triacanthos Willdenow Enum. Pl., suppl.: 34. 1814
Synonyms: Opuntia abjecta Small ex Britton & Rose Opuntia militaris Britton & Rose
Treatment appears in FNA Volume 4. Treatment on page 130. Mentioned on page 126.

Shrubs, prostrate (to erect), clambering, to 0.6 m. Stem segments easily detached, green, flattened, elliptic, 5–18 × 3–7 cm, slightly tuberculate, glabrous; areoles 3–4 per diagonal row across midstem segment, subcircular, 4 mm diam.; wool whitish. Spines 1–3 (–4) per areole, ± evenly distributed on stem segment, porrect to spreading, gray to whitish or cream, tipped black, straight, acicular, to 40 mm, barbed. Glochids yellow, aging brown, 4–9 mm. Flowers: inner tepals yellow throughout, 20–25 mm; filaments pale green to yellow; anthers yellow; style pale green or white, pink tinged; stigma lobes color unknown. Fruits red, ovoid to obovoid, 25–30 × 15–20 mm, fleshy, glabrous, bearing few areoles, spineless. Seeds tan, subcircular, somewhat flattened, 2.5 mm diam.; girdle protruding less than 1 mm. 2n = 22.


Phenology: Flowering year-round.
Habitat: Sandy areas on old limestone reefs, openings in tropical forests
Elevation: 0 m

Discussion

Opuntia triacantha occurs in the flora area only on Big Pine Key, Florida. It is in the Center for Plant Conservation’s National Collection of Endangered Plants.

Selected References

None.

Lower Taxa

None.
... more about "Opuntia triacantha"
cushionlike +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (1 cm10 mm <br />0.01 m <br />) +
4 cm40 mm <br />0.04 m <br /> (?) +
deciduous +  and persistent +
0.3 cm3 mm <br />0.003 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
few +, 3 +  and 4 +
subcircular +
0.1 cm1 mm <br />0.001 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
Donald J. Pinkava +
(Willdenow) Sweet +
Cactus triacanthos +
proliferating +
flattened +  and cylindric +
Fla. +  and West Indies +
pale green +  and yellow +
15 cm150 mm <br />0.15 m <br /> (30 cm300 mm <br />0.3 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (15 cm150 mm <br />0.15 m <br />) +
burlike +  and spiny +
straight +
indehiscent +
persistent +, long +  and deciduous +
25mm;30mm +
proliferating +
tuberculate +  and smooth +
ovoid +  and obovoid +
1.5 cm15 mm <br />0.015 m <br /> (2 cm20 mm <br />0.02 m <br />) +
0 cm0 mm <br />0 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
foveolate +  and reticulate +
Sandy areas on old limestone reefs, openings in tropical forests +
oblong +  and spatulate +
2 cm20 mm <br />0.02 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
deciduous +
flattened +  and conic +
0 cm0 mm <br />0 m <br /> (3 cm30 mm <br />0.03 m <br />) +
succulent +
tuberculate +
fluted;spheric;depressed-spheric or club-shaped +
tinged color +
open +  and simple +
sometimes covered by outgrowths of proximal portion of style base or of flower tube wall +  and open +
persistent +  and deciduous +
Flowering year-round. +
ridgelike +  and nipple--shaped +
Hort. Brit., +
3;2;2;30 +
tuberlike +
2.5 cm25 mm <br />0.025 m <br /> (?) +
0.2 cm2 mm <br />0.002 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
flattened;subcircular +
0.2 cm2 mm <br />0.002 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
not sheathed +
distributed +
7.5 cm75 mm <br />0.075 m <br /> (17 cm170 mm <br />0.17 m <br />) +
tipped black +, gray +  and whitish or cream +
straight +
deciduous +  and persistent +
porrect +  and spreading +
conspicuous +
with hairlike bristles +  and setose +
1 (?) +  and 3 (?) +
acicular +
0 cm0 mm <br />0 m <br /> (4 cm40 mm <br />0.04 m <br />) +
hard +  and rigid +
decurrent +
winged +  and unsegmented +
tuberculate +  and smooth +
60 cm600 mm <br />0.6 m <br /> (120 cm1,200 mm <br />1.2 m <br />) +
5 cm50 mm <br />0.05 m <br /> (18 cm180 mm <br />0.18 m <br />) +
3 cm30 mm <br />0.03 m <br /> (7 cm70 mm <br />0.07 m <br />) +
segmented +
woody +  and succulent +
pink tinged +, white +  and pale green +
Opuntia abjecta +  and Opuntia militaris +
adventitious +
tuberlike +
epipetric +  and epiphytic +
Opuntia triacantha +
species +
dull +  and glossy +
yellow +  and paler +
segmented +
terrestrial;epiphytic or epipetric +