The green links below add additional plants to the comparison table. Blue links lead to other Web sites.
enable glossary links

variableleaf bushbean

supine bean

Habit Herbs, perennial; root turnip-shaped, small. Herbs, perennial; root turnip-shaped.
Stems

prostrate, solid, strigulose or hirsute.

prostrate, solid, hirsute.

Leaves

stipules spreading, widely deltate or ovate, 4.5–8 × 2–2.7 mm;

petiole 1.7–6 cm, strigose or hirsute;

rachis 5–9 mm;

stipels subulate, 1–5.5 mm;

leaflets papery, blades orbiculate, ovate to broadly ovate or obovate, base attenuate or cuneate, apex acute or obtuse, surfaces strigose abaxially, hirtellous adaxially;

lateral blades 2–4.3 × 1.6–2.9 cm, sometimes 2-lobed, terminal blades 2.3–4.7 × 1.6–2.8 cm.

stipules spreading, ovate-lanceolate, 2.3–6.2 × 1.5–2 mm;

petiole 2–5 cm, hirsute;

rachis 5–7 mm;

stipels subulate or linear, 1–2.5 mm;

leaflets leathery, blades linear, base rounded or cuneate, margins entire, apex acute, surfaces densely hispid abaxially, glabrescent adaxially;

lateral blades 3.8–4.5 × 0.9–1.1 cm, terminal blades 2.5–4.2 × 0.5–0.8 cm.

Inflorescences

14–25 cm (cleistogamous inflorescence over soil, 1.5–2.2 mm, flowers 3.5 mm, corolla whitish), axes adpressed-pilose;

tufts of bracts at base of peduncle mostly caducous;

extrafloral nectaries inconspicuous at nodes;

bracts and bracteoles subulate or lanceolate.

11–15 cm, (cleistogamous inflorescence above soil, 3.9–6.3 mm, flowers 6 mm, corolla whitish), axes glabrous;

tufts of bracts at base of peduncle mostly caducous;

extrafloral nectaries inconspicuous at nodes;

bracts and bracteoles subulate.

Pedicels

0.7–1 mm.

0.6 mm.

Flowers

1 cm;

calyx campanulate, 3.5–4.5 mm, hirtellous, calyx lobes as long as tube or longer;

corolla salmon-orange;

banner orbiculate, 5.5–7.5 × 4.5–6.5 mm;

wings oblong-ovate, 5.1–10 × 3.3–6.6 mm;

keel 4–8 mm;

ovary nectary disc distally even;

ovules 6.

0.9 cm;

calyx campanulate, 2–2.3 mm, hirsute or glabrescent, calyx lobes as long as the tube or longer;

corolla red;

banner obovate, 5.3 × 5 mm;

wings oblong-ovate, 8.1–8.9 × 3.2–5.4 mm;

keel 6.2 mm;

ovary nectary disc distally even;

ovules 4.

Legumes

pendent, oblong-falcate, 1.6–2.5 × 2.7–3 cm, valves not twisting at dehiscence.

pendent, oblong-falcate, 1 × 0.2–0.3 cm, valves not twisting at dehiscence.

Seeds

4 or 5, oblong, 2.9–3 × 2–2.2 mm.

2 or 3 (or 4), reniform, 1.7–2.3 × 1.2–3.5 mm.

Macroptilium gibbosifolium

Macroptilium supinum

Phenology Flowering Jul–Sep. Flowering Sep–Nov.
Habitat Rocky summits, oak forests, savanna-grasslands. Slopes, grasslands.
Elevation 1300–2500 m. (4300–8200 ft.) 300–900 m. (1000–3000 ft.)
Distribution
from FNA
AZ; NM; TX; Mexico; Central America
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; Mexico (Nayarit, Sonora)
[BONAP county map]
Discussion

Phaseolus micranthus M. Martens & Galeotti and P. parviflorus Schlechtendal are illegitimate names that pertain here.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

In the flora area, Macroptilium supinum is found only in Pima and Santa Cruz counties (A. Delgado-Salinas and L. Torres-Colín 1995).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 11. FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Macroptilium Fabaceae > subfam. Faboideae > Macroptilium
Sibling taxa
M. atropurpureum, M. lathyroides, M. supinum
M. atropurpureum, M. gibbosifolium, M. lathyroides
Synonyms Phaseolus gibbosifolius, M. heterophyllum, M. heterophyllum var. rotundifolium, P. bilobatus, P. heterophyllus, P. heterophyllus var. rotundifolius, P. macropoides, P. macropus, P. rotundifolius, P. seleri Phaseolus supinus
Name authority (Ortega) A. Delgado: Syst. Bot. 6: 295. (1981) (Wiggins & Rollins) A. Delgado & L. Torres-Colín: Anales Inst. Biol. Univ. Nac. Autón. México, Bot. 66: 189. (1996)
Web links