Grusonia schottii

(Engelmann) H. Robinson

Phytologia 26: 176. 1973.

Common names: Clav ellina
Basionyms: Opuntia schottii Engelmann Proc. Amer. Acad. Arts 3: 304. 1856
Synonyms: Corynopuntia schottii (Engelmann) F. M. Knuth
Treatment appears in FNA Volume 4. Treatment on page 121. Mentioned on page 119.

Shrubs, forming mats, 7.5–9 cm. Roots diffuse. Stem segments clavate, (2–) 3.5–6.5 × (1.5–) 2–3 cm; tubercles 8–20 mm, 1–3.5 times longer than wide, not or little obscured by spines; areoles 2.5–4 mm in diam.; wool white to yellowish. Spines 11–17 per areole, mostly in distal areoles, spreading to deflexed, white, tan, or redbrown, longest 3–7 cm; major 3 abaxial spines divergent or deflexed, tan to brown, flattened to angular-flattened, sharp-edged; major 2–3 adaxial spines ascending-divergent, redbrown, subterete to angular-flattened. Glochids adaxial in areole, yellowish white to yellow, to 7 mm. Flowers: inner tepals bright-yellow, ± 20 mm; filaments yellow; style cream; stigma lobes cream or tinged pink. Fruits yellow, cylindric to ellipsoid, 30–50 × 10–30 mm, fleshy, spineless (sometimes with 3–6 white or red spines to 6 mm), yellow glochidiate; areoles 25–35. Seeds yellowish white to yellow, 4.5–5 × 3.5 mm, smooth. 2n = 44.


Phenology: Flowering late spring–early summer (Jun–Jul).
Habitat: Chihuahuan Desert, sandy or gravelly flats, low hills
Elevation: 700-1200 m

Discussion

Plants restricted to clay soils in Big Bend National Park, Brewster County, Texas, with more spines per areole than Grusonia schottii, have been named G. densispina (Ralston & Hilsenbeck) Pinkava. Much additional study is required to determine the relationship between such plants and G. schottii.

Selected References

None.

Lower Taxa

None.

... more about "Grusonia schottii"
tan +  and brown +
flattened +  and angular-flattened +
ascending-divergent +
cushionlike +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
deciduous +  and persistent +
25 +  and 35 +
cushionlike +
Donald J. Pinkava +
(Engelmann) H. Robinson +
curving +
dislodged +
cylindric-clavate +
Opuntia schottii +
proliferating +
flattened +  and cylindric +
Clav ellina +
Tex. +  and Mexico (Coahuila) +
700-1200 m +
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 />) +
yellow;yellow +
indehiscent +
persistent +, long +  and deciduous +
30mm;50mm +
glochidiate +
cylindric +  and ellipsoid +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
not protruding +
0 cm0 mm <br />0 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
Chihuahuan Desert, sandy or gravelly flats, low hills +
20 cm200 mm <br />0.2 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 +
sometimes covered by outgrowths of proximal portion of style base or of flower tube wall +  and open +
persistent +  and deciduous +
Flowering late spring–early summer (Jun–Jul). +
ridgelike +  and nipple--shaped +
3;2;2;30 +
adventitious +
tuberlike +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
pubescent +  and glabrous +
flattened;suborbicular +
3.5 cm35 mm <br />0.035 m <br /> (?) +
redbrown +, tan +  and white +
deciduous +  and persistent +
spreading +  and deflexed +
conspicuous +
11 (?) +  and 17 (?) +
terete +  and strongly flattened +
3 cm30 mm <br />0.03 m <br /> (7 cm70 mm <br />0.07 m <br />) +
hard +  and rigid +
decurrent +
winged +  and unsegmented +
tuberculate +  and smooth +
2 cm20 mm <br />0.02 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (2 cm20 mm <br />0.02 m <br />) +
3.5 cm35 mm <br />0.035 m <br /> (6.5 cm65 mm <br />0.065 m <br />) +
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
segmented +
woody +  and succulent +
tinged pink +  and cream +
Corynopuntia schottii +
adventitious +
tuberlike +
epipetric +  and epiphytic +
Grusonia schottii +
Grusonia +
species +
dull +  and glossy +
0.8 cm8 mm <br />0.008 m <br /> (2 cm20 mm <br />0.02 m <br />) +
conspicuous +
terrestrial;epiphytic or epipetric +
trailing +  and erect +
white +  and yellowish +