Euphorbia strictior

Holzinger

Contr. U.S. Natl. Herb. 1: 214, plate 18. 1892.

Common names: Panhandle spurge
Endemic
Treatment appears in FNA Volume 12. Treatment on page 251. Mentioned on page 241, 242.

Herbs, perennial, with cylindric rootstock. Stems erect, branched, densely clumped, previous year’s dead stems often persistent, 30–70 cm, glabrous. Leaves alternate, persisting, spreading or ascending; stipules to 0.1 mm; petiole absent; blade linear to narrowly oblanceolate, (20–) 40–70 × (2–) 4–5 mm, base narrowly cuneate, margins entire, apex broadly acute, surfaces glabrous; venation obscure, only midvein conspicuous on wider leaves. Cyathia in terminal dichasia; peduncle (2–) 4–12 (–18) mm proximal and mid peduncles and cyathia abscising early, sparsely to moderately strigose to sericeous. Involucre campanulate or hemispheric, 1.2–2.4 × 2.2–3.2 mm, pilose; glands 5, green, broadly elliptic, 0.7–0.8 × 1.3–1.6 mm; appendages white, forming narrow rim around distal margin of gland, 0.2 × 1.5–1.8 mm, entire or erose. Staminate flowers 20–25. Pistillate flowers: ovary strigillose to tomentulose; styles 0.4–0.6 mm, 2-fid at apex. Capsules globose, all 3 locules fertile, 3.2–4.5 × 4–6.5 mm, sparsely strigillose; columella 2.5–3.9 mm. Seeds gray-green to gray-brown, ovoid, 3.8 × 3 mm, shallowly and obscurely pitted; caruncle absent.


Phenology: Flowering and fruiting spring–fall.
Habitat: Open grasslands and uplands.
Elevation: 900–1400 m.

Discussion

Euphorbia strictior is confined to a small area of the Texas Panhandle and adjacent New Mexico. The species is closely related to E. aaron-rossii and E. wrightii; it can be distinguished from E. wrightii by its larger stature, shorter and less petaloid involucral gland appendages, and early abscising proximal and mid cyathia and peduncles. Euphorbia strictior also tends to develop all three seeds in the capsule, whereas E. wrightii tends to develop only two.

Selected References

None.

Lower Taxa

None.
... more about "Euphorbia strictior"
0.2 cm2 mm <br />0.002 m <br /> (?) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
Jess A. Peirson +, Victor W. Steinmann +  and Jeffery J. Morawetz +
Holzinger +
cuneate +
Alectoroctonum +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
4 cm40 mm <br />0.04 m <br /> (7 cm70 mm <br />0.07 m <br />) +
linear;narrowly oblanceolate +
4mm;5mm +
whorled +  and not opposite +
cymose +, few-branched +  and unbranched +
additional +
exfoliating +
ceraceous +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.39 cm3.9 mm <br />0.0039 m <br />) +
Panhandle spurge +
N.Mex. +  and Tex. +
900–1400 m. +
pistillate +  and staminate +
0.7mm;0.8mm +
subtending +
convex +, flat +  and concave +
1.3mm +  and 1.6mm +
Open grasslands and uplands. +
pleiochasial +  and dichasial +
axillary +  and terminal +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.24 cm2.4 mm <br />0.0024 m <br />) +
hemispheric +  and campanulate +
0.22 cm2.2 mm <br />0.0022 m <br /> (0.32 cm3.2 mm <br />0.0032 m <br />) +
persisting +
bractlike +
3.2mm +  and 4.5mm +
strigillose +
0.4 cm4 mm <br />0.004 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
palmate +  and pinnate +
crenulate +
strigillose;tomentulose +
1.2 cm12 mm <br />0.012 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
connate;distinct +
hairy +  and glabrous +
Flowering and fruiting spring–fall. +
opposite +  and whorled +
with white margins +  and green +
Contr. U.S. Natl. Herb. +
3.8 cm38 mm <br />0.038 m <br /> (?) +
3 cm30 mm <br />0.03 m <br /> (?) +
free +, connate +  and distinct +
persistent +
prostrate +  and decumbent +
30 cm300 mm <br />0.3 m <br /> (70 cm700 mm <br />0.7 m <br />) +
deciduous +  and persistent +
0 cm0 mm <br />0 m <br /> (0.01 cm0.1 mm <br />1.0e-4 m <br />) +
connate +  and distinct +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (?) +  and 0.06 cm0.6 mm <br />6.0e-4 m <br /> (?) +
Agaloma +  and Tithymalopsis +
Euphorbia strictior +
Euphorbia sect. Alectoroctonum +
species +
in terminal monochasia +  and solitary +
10 +, 9 +, 8 +, 7 +  and 6 +