Rhinotropis rusbyi

(Greene) J. R. Abbott

J. Bot. Res. Inst. Texas 5: 135. 2011.

Common names: Rusby’s milkwort
Basionym: Polygalarusbyi greene Bull. Torrey Bot. Club 10: 125. 1883
Treatment appears in FNA Volume 10.

Herbs or subshrubs, usually multistemmed, 0.2–1.2 dm. Stems decumbent to erect, densely pubescent, hairs spread­ing. Leaves subsessile; blade elliptic or obovate, 6–20 (–26) × 3–10 (–12) mm, base cuneate, apex acute or obtuse, surfaces pubescent, hairs spreading. Racemes terminal, sometimes leaf-opposed, 1–3.5 × 1.5–2.8 cm; rachis weakly thorn-tipped (often not clearly visible when young); peduncle 0–0.5 cm; bracts semipersistent, lanceolate to linear. Pedicels 3–7 (–8.6) mm, pubescent. Flowers pink-and-white, sepals pink or brownish pink, margins white, keel beak yellow to yellow-green, (7.5–) 8.5–13 (–14) mm; sepals persistent, elliptic or ovate, (3–) 3.5–6 (–7) mm, glabrous or sparsely pubescent; wings narrowly elliptic to obovate, (7.2–) 8–11.5 (–12.3) ×3.2–5.6 mm, glabrous or sparsely pubescent; keel (6.5–) 7.2–10.7 mm, sac spreading-pubescent in distal 1/2, sometimes also proximally, beak oblong, (1.6–) 1.9–3.2 × (0.5–) 0.7–1 mm, pubescent. Capsules ellipsoid, 4.8–8.5 × 4–5.7 mm, base obtuse or rounded, margins with very narrow wing, sparsely pubescent. Seeds 3.5–4.8 mm, pubescent; aril 0.8–2.6 mm, lobes 0–1/2 length of seed. 2n = 18.


Phenology: Flowering spring–mid summer.
Habitat: Calcareous or gypseous soil in open pinyon-juniper woodlands or transition to desert scrub.
Elevation: 900–1800 m.

Discussion

Rhinotropis rusbyi occurs in Coconino, Maricopa, Mohave, and Yavapai counties.

Selected References

None.

Lower Taxa

None.
... more about "Rhinotropis rusbyi"
obtuse +  and acute +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.26 cm2.6 mm <br />0.0026 m <br />) +
J. Richard Abbott +
(Greene) J. R. Abbott +
rounded +, obtuse +  and cuneate +
Polygalarusbyi greene +
0.16 cm1.6 mm <br />0.0016 m <br /> (0.19 cm1.9 mm <br />0.0019 m <br />) +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
reduced +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
2 cm20 mm <br />0.02 m <br /> (2.6 cm26 mm <br />0.026 m <br />) +
1 cm10 mm <br />0.01 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (2 cm20 mm <br />0.02 m <br />) +
obovate +  and elliptic +
uniform +
glabrous +  and pubescent +
0.3 cm3 mm <br />0.003 m <br /> (1 cm10 mm <br />0.01 m <br />) +
semipersistent +
lanceolate +  and linear +
0.48 cm4.8 mm <br />0.0048 m <br /> (0.85 cm8.5 mm <br />0.0085 m <br />) +
ellipsoid +
0.4 cm4 mm <br />0.004 m <br /> (0.57 cm5.7 mm <br />0.0057 m <br />) +
Rusby’s milkwort +
reduced +
900–1800 m. +
sessile +  and pedicellate +
0.24 cm2.4 mm <br />0.0024 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
pink-and-white +
in proximal leaf-axils +  and subterranean +
cleistogamous +  and chasmogamous +
0.35 cm3.5 mm <br />0.0035 m <br /> (1.45 cm14.5 mm <br />0.0145 m <br />) +
samaroid +  and pseudomonomerous +
glabrous +  and pubescent +
isodiametric +  and slightly oblong +
Calcareous or gypseous soil in open pinyon-juniper woodlands or transition to desert scrub. +
spreading +  and spread +
perennial +
leaf-opposed +  and terminal +
0.65 cm6.5 mm <br />0.0065 m <br /> (0.72 cm7.2 mm <br />0.0072 m <br />) +
1.3 cm13 mm <br />0.013 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
yellow +  and yellow-green +
0.85 cm8.5 mm <br />0.0085 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
pubescent +  and glabrous +
0.72 cm7.2 mm <br />0.0072 m <br /> (1.07 cm10.7 mm <br />0.0107 m <br />) +
basal +  and cauline +
not +  and winged +
leaf-opposed +, axillary +  and terminal +
0.7 cm7 mm <br />0.007 m <br /> (0.86 cm8.6 mm <br />0.0086 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0 cm0 mm <br />0 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Flowering spring–mid summer. +
syncarpous +  and 2[-8]-carpellate +
aggregated +  and fasciculate +
J. Bot. Res. Inst. Texas +
1 cm10 mm <br />0.01 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
leaf-opposed +
1.5 cm15 mm <br />0.015 m <br /> (2.8 cm28 mm <br />0.028 m <br />) +
usually brownish +  and whitish +
exfoliating +
spreading-pubescent +
ellipsoid +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.48 cm4.8 mm <br />0.0048 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
brownish pink +  and pink +
persistent +
pubescent +  and glabrous +
ovate +  and elliptic +
unequal +
0.35 cm3.5 mm <br />0.0035 m <br /> (?) +  and 0.6 cm6 mm <br />0.006 m <br /> (?) +
9 +, 8 +  and 7 +
decumbent +  and prostrate +
decumbent +  and erect +
not +  and petiolate +
Rhinotropis rusbyi +
Rhinotropis +
species +
crested +  and lobed +
1.15 cm11.5 mm <br />0.0115 m <br /> (1.23 cm12.3 mm <br />0.0123 m <br />) +
deciduous +
0.8 cm8 mm <br />0.008 m <br /> (1.15 cm11.5 mm <br />0.0115 m <br />) +
pubescent +  and glabrous +
narrowly elliptic +  and obovate +
0.25 cm2.5 mm <br />0.0025 m <br /> (1.25 cm12.5 mm <br />0.0125 m <br />) +
3.2mm;5.6mm +