Eremogone macradenia

(S. Watson) Ikonnikov

Novosti Syst. Vyssh. Rast. 10: 140. 1973.

Common names: Mohave sandwort
Endemic
Basionym: Arenaria macradenia S. Watson Proc. Amer. Acad. Arts 17: 367. 1882
Treatment appears in FNA Volume 5. Treatment on page 68. Mentioned on page 57, 58, 65.

Plants tufted, green, not glaucous, with woody base. Stems erect, (10–) 20–40 (–70) cm, glabrous to stipitate-glandular. Leaves: basal leaves sparse or absent; cauline leaves usually in 5–12+ pairs, not significantly reduced; basal blades ascending to arcuate-spreading or recurved, needlelike or narrowly linear, (0.7–) 2–6 (–7) cm × 0.8–2 mm, ± rigid, herbaceous to subsucculent, apex blunt to spinose, glabrous, not glaucous. Inflorescences 3–20 (–30) -flowered, ± compact cymes; branches ascending to erect. Pedicels 3–45 mm, glabrous or stipitate-glandular. Flowers: sepals 1–3-veined, ovate to lanceolate or elliptic, 4.5–7.2 mm, to 8 mm in fruit, margins narrow to broad, apex acute to acuminate, glabrous to sparsely stipitate-glandular; petals white or yellowish, oblanceolate to spatulate, 6–11 mm, 1–2 times as long as sepals, apex entire or erose; nectaries thickened, molarlike, apically 2-lobed, 1–1.5 mm, or narrowly longitudinally rectangular, truncate, 0.7–0.8 mm, densely minutely pubescent with erect to spreading hairs. Capsules 6–8 mm, glabrous. Seeds greenish or reddish-brown to blackish, suborbicular to pyriform or ovoid, 1.3–3.2 mm, tuberculate, sometimes echinate on abaxial ridge; tubercles low, rounded to conic.

Discussion

Varieties 2 (2 in the flora).

Eremogone macradenia is in the Center for Plant Conservation’s National Collection of Endangered Plants.

Selected References

None.

Key

1 Cauline leaves mostly in 5-8 pairs, blade ± ascending throughout, 0.8-1.2 mm wide Eremogone macradenia var. macradenia
1 Cauline leaves mostly in 6-12+ pairs, blade curved downward, especially proximal ones, 1.2-2 mm wide Eremogone macradenia var. arcuifolia

"-2timesaslongassepals" is not declared as a valid unit of measurement for this property.

... more about "Eremogone macradenia"
erose +  and entire +
spinose +  and apiculate +
glabrous +  and sparsely stipitate-glandular +
Ronald L. Hartman +, Richard K. Rabeler +  and Frederick H. Utech +
(S. Watson) Ikonnikov +
6 cm60 mm <br />0.06 m <br /> (7 cm70 mm <br />0.07 m <br />) +
2 cm20 mm <br />0.02 m <br /> (6 cm60 mm <br />0.06 m <br />) +
linear +  and needlelike +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Arenaria macradenia +
filiform +  and subulate or narrowly linear +
? (?) +  and ? (?) +
reduced +
ascending +  and erect +
ovoid;urceolate +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
Mohave sandwort +
dish--shaped +
expanded +
Ariz. +, Calif. +, Nev. +  and Utah +
straight +  and curved +
central +  and peripheral +
inconspicuous +
unisexual +  and bisexual +
stalked +  and simple +
erect +  and spreading +
disc--shaped +  and dish +
3-20(-30)-flowered +
connate +
narrow +  and broad +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
swollen +
3 +  and 5 +
crassinucellate +  and bitegmic +
campylotropous +
stipitate-glandular +  and glabrous +
0.3 cm3 mm <br />0.003 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
fugacious +
0.6 cm6 mm <br />0.006 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
Novosti Syst. Vyssh. Rast. +
tuberculate +
suborbicular +  and pyriform or ovoid +
persistent +
connate +  and distinct +
ovate;lanceolate or elliptic +
0 cm0 mm <br />0 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
branched +  and simple +
20 cm200 mm <br />0.2 m <br /> (40 cm400 mm <br />0.4 m <br />) +
[50 +  and 3 +
smooth +  and papillate +
distinct +
filiform +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Stout (?) +  and Slender (?) +
Eremogone macradenia +
Eremogone +
species +
ascending;recurved +
divided +
rounded +  and conic +
10 +  and 8 +
rhizomatous +  and taprooted +