Euphorbia macropus

(Klotzsch & Garcke) Boissier in A. P. de Candolle and A. L. P. P. de Candolle

Prodr. 15(2): 52. 1862.

Common names: Huachuca mountain spurge
Basionym: Anisophyllum macropus Klotzsch & Garcke Abh. Königl. Akad. Wiss. Berlin 1859: 33. 1860
Synonyms: Euphorbia biformis S. Watson E. plummerae S. Watson
Treatment appears in FNA Volume 12. Treatment on page 248. Mentioned on page 241.

Herbs, perennial, with thick, globose to elongated tubers, 2–8 cm. Stems erect to ascending, branched, 10–45 (–60) cm, glabrous, puberulent, or densely hirsute to setose, often with 2-layered indumentum of long hairs intermixed with short hairs. Leaves usually opposite, occasionally whorled distally, or rarely with 1–2 alternate leaves; stipules 0.1–0.2 mm; petiole 0–18 mm, hirsute, sericeous, or strigose; blade linear to ovate or almost orbiculate, 6–54 × 2–19 mm, base rounded to attenuate, margins entire, occasionally ciliate with stiff recurved hairs, apex acute to obtuse, surfaces usually hirsute, sericeous, or strigose, occasionally glabrous adaxially; venation conspicuous. Cyathia in weakly-defined terminal dichasia; peduncle 1.4–5.8 mm, glabrous. Involucre obconic to campanulate, 1.1–1.4 × 0.5–1.5 mm, glabrous or strigillose; glands 4–5, greenish, oblong, 0.2 × 0.4–0.5 mm; appendages usually yellowish or green, rarely dark purple, ovate, flabellate, semiorbiculate, or oblong, 0.3–0.9 × 0.4–1.1 mm, usually entire. Staminate flowers 10–15. Pistillate flowers: ovary glabrous, sericeous, or strigillose; styles 0.4–0.6 mm, 2-fid 1/2 length. Capsules oblate, 2.3–3 × 3.1–4.2 mm, glabrous, sericeous, or strigillose; columella 1.6–2.1 mm. Seeds black to light-brown, broadly ovoid to subglobose, rounded in cross-section, 1.5–2.3 × 1.4–1.8 mm, smooth or with low rounded tubercles; caruncle absent.


Phenology: Flowering and fruiting summer–fall.
Habitat: Stream banks and rocky slopes in pine-oak woodlands, sometimes with juniper, Douglas fir-pine forests.
Elevation: 1500–2200m.

Distribution

V12 741-distribution-map.jpg

Ariz., Mexico, Central America (Guatemala), Central America (Honduras)

Discussion

Euphorbia macropus is a widespread and common Mexican species just barely entering the flora area in southeastern Arizona, where most of the collections are from the Huachuca Mountains.

Selected References

None.

Lower Taxa

None.

"elongated" is not a number."thick" is not a number.

... more about "Euphorbia macropus"
dark purple;green;yellowish +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
oblong +, semiorbiculate +, flabellate +  and ovate +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.11 cm1.1 mm <br />0.0011 m <br />) +
Jess A. Peirson +, Victor W. Steinmann +  and Jeffery J. Morawetz +
(Klotzsch & Garcke) Boissier in A. P. de Candolle and A. L. P. P. de Candolle +
rounded +  and attenuate +
Anisophyllum macropus +
0.6 cm6 mm <br />0.006 m <br /> (5.4 cm54 mm <br />0.054 m <br />) +
orbiculate;linear;ovate +
2mm;19mm +
whorled +  and not opposite +
cymose +, few-branched +  and unbranched +
additional +
0.23 cm2.3 mm <br />0.0023 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
strigillose +, sericeous +  and glabrous +
0.31 cm3.1 mm <br />0.0031 m <br /> (0.42 cm4.2 mm <br />0.0042 m <br />) +
exfoliating +
ceraceous +
0.16 cm1.6 mm <br />0.0016 m <br /> (0.21 cm2.1 mm <br />0.0021 m <br />) +
Huachuca mountain spurge +
Ariz. +, Mexico +, Central America (Guatemala) +  and Central America (Honduras) +
1500–2200m. +
pistillate +  and staminate +
subtending +
4 (?) +  and 5 (?) +
0.4mm +  and 0.5mm +
Stream banks and rocky slopes in pine-oak woodlands, sometimes with juniper, Douglas fir-pine forests. +
pleiochasial +  and dichasial +
axillary +  and terminal +
0.11 cm1.1 mm <br />0.0011 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
strigillose +  and glabrous +
obconic +  and campanulate +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
alternate +, whorled +  and opposite +
caducous +, deciduous +  and persistent +
1 (?) +  and 2 (?) +
bractlike +
palmate +  and pinnate +
crenulate +
strigillose;sericeous;strigillose;sericeous;glabrous +
0.14 cm1.4 mm <br />0.0014 m <br /> (0.58 cm5.8 mm <br />0.0058 m <br />) +
connate;distinct +
strigose +, sericeous +  and hirsute +
0 cm0 mm <br />0 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
Flowering and fruiting summer–fall. +
opposite +  and whorled +
with white margins +  and green +
rounded +, broadly ovoid +  and subglobose +
free +, connate +  and distinct +
prostrate +  and decumbent +
erect +  and ascending +
10 cm100 mm <br />0.1 m <br /> (45 cm450 mm <br />0.45 m <br />) +
deciduous +  and persistent +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (?) +  and 0.06 cm0.6 mm <br />6.0e-4 m <br /> (?) +
glabrous +, strigose +, sericeous +  and hirsute +
Euphorbia biformis +  and E. plummerae +
Euphorbia macropus +
Euphorbia sect. Alectoroctonum +
species +
globose +
in terminal monochasia +  and solitary +
10 +, 9 +, 8 +, 7 +  and 6 +