Phyllanthopsis arida

(Warnock & M. C. Johnston) Vorontsova & Petra Hoffmann

Kew Bull. 63: 47. 2008.

IllustratedConservation concern
Basionym: Savia arida Warnock & M. C. Johnston SouthW. Naturalist 5: 3. 1960
Synonyms: Andrachne arida (Warnock & M. C. Johnston) G. L. Webster
Treatment appears in FNA Volume 12. Treatment on page 332. Mentioned on page 331.

Shrubs, dioecious, (2–) 4–6 (–10) dm. Stems highly branched, branches spreading, longest leafy branchlets to 10 cm. Leaves: petiole 0.5–3 mm; blade elliptic, 4–10 × 3–6 mm, base cuneate to rounded, apex acute to rounded or mucronate, both surfaces pilose; secondary-vein pairs 1–3, obscure. Inflorescences: staminate flowers usually solitary, sometimes 2–3 per fascicle; pistillate flowers usually solitary, rarely 2 per fascicle. Staminate flowers: sepals oblong to obovate, 1–1.5 mm; petals 0.8–1 mm; nectary 10- or irregularly crenulate; pistillode pilose. Pistillate flowers: sepals elliptic to oblong, 1–1.5 mm; petals 0.4–0.6 mm; nectary 5-crenate to 10-crenate; pistil 3 (–4) -carpellate. Capsules subglobose, 5–6 mm diam., shallowly 3 (–4) -lobed; columella 2 mm. Seeds dark-brown, 2.5–3 mm; caruncle absent.


Phenology: Flowering and fruiting Jul–Sep.
Habitat: Scrub and rock crevices, limestone.
Elevation: 1000–2500 m.

Distribution

V12 521-distribution-map.jpg

Tex., Mexico (Chihuahua), Mexico (Coahuila)

Discussion

Phyllanthopsis arida is rare; populations are highly localized, known only from El Solitario and the Dead Horse Mountains in the Big Bend region of Texas and two localities in nearby Mexico. Its distribution may be relictual (B. H. Warnock and M. C. Johnston 1960).

Selected References

None.

Lower Taxa

None.

"connate" is not a number."/2" is not declared as a valid unit of measurement for this property."dm" is not declared as a valid unit of measurement for this property.

... more about "Phyllanthopsis arida"
distinct +
acute;rounded or mucronate +
Maria S. Vorontsova +
(Warnock & M. C. Johnston) Vorontsova & Petra Hoffmann +
cuneate;rounded +
Savia arida +
0.4 cm4 mm <br />0.004 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
3(-4)-lobed +  and subglobose +
2 cm20 mm <br />0.02 m <br /> (?) +
Tex. +, Mexico (Chihuahua) +  and Mexico (Coahuila) +
1000–2500 m. +
pistillate +  and staminate +
Scrub and rock crevices, limestone. +
not branching +  and simple +
paniclelike +  and racemelike +
persistent +
0 cm0 mm <br />0 m <br /> (10 cm100 mm <br />0.1 m <br />) +
extrastaminal +
5-crenate +  and 10-crenate +
distinct +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Flowering and fruiting Jul–Sep. +
3(-4)-carpellate +
dark-brown +
rounded-trigonous +
0.25 cm2.5 mm <br />0.0025 m <br /> (?) +  and 0.3 cm3 mm <br />0.003 m <br /> (?) +
persistent +
distinct +
elliptic;oblong +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
Illustrated +  and Conservation concern +
free +, connate +  and distinct +
distinct +
Andrachne arida +
Phyllanthopsis arida +
Phyllanthopsis +
species +
evergreen +, deciduous +, annual +  and perennial +
hairy +  and glabrous +