Coulteria, Kunth, 2016

Sotuyo, Solange, Contreras, José Luis, Gagnon, Edeline & Lewis, Gwilym P., 2016, A synopsis of Coulteria (Leguminosae), including new names and synonyms, Phytotaxa 291 (1), pp. 33-42 : 35

Key to species of Coulteria

1. Legume 4–7 × 1.3–3 cm, oblong, elliptic, suborbicular to broadly oval; shrubs or small trees up to 3 m in height.........................2

- Legume 7–15 × 2.5–5 cm, oblong to elliptic; medium to large trees, more than 3 m in height........................................................3

2. Shrubs; leaflets glabrous, suborbicular, 0.6–2.5 × 0.5–2.5 cm; legume 4–4.5 × 1.3–2.3 cm, suborbicular to broadly ovate, apiculate, 1–2-seeded; endemic along coastal plains and on rocky hills in Sonora, México............................................................... C. pumila

- Shrubs or small trees; leaflets densely pubescent below, obovate, 1.7–8.5 × 1.2–4.5 cm; legume 5–7 × 2.5–3 cm, oblong to elliptic, mucronate, densely pubescent on both surfaces, 1–3-seeded; in dry forest and bushland, in Hidalgo, Querétaro, San Luis Potosí, Tamaulipas and Guanajuato, México................................................................................................................................. C. pringlei

3. Legume borne on a stout stipe, 3–4 mm long, legume pedicel about 1 cm long, this pubescent or tomentose, leaflets pilose to glabrate on the adaxial surface and pubescent to glabrate on the abaxial surface..................................................................................4

- Legume stipe slender, 6–10 mm long or longer, legume pedicel 1.3–1.7 cm long, leaflets and fruits with a diverse range of indumenta..................................................................................................................................................................................................5

4. Young branchlets and inflorescences sericeous or pubescent; legume oblong, 7–14 × 3–4 cm, glabrous; leaflets oblong-lanceolate, 3–6 × 1.5–3 cm, glabrous ..................................................................................................................................................... C. glabra

- Young branchlets and inflorescences ferrugineous-tomentose; legume tomentose, oblong-elliptic, 9–11 × 2.8–4 cm; leaflets pilose except along the midvein below, ovate, 2–6.2 × 1–2.5 cm .............................................................................................. C. platyloba

5. Legume 10–15 × 2.5–5 cm, borne on a 10–15 mm long stipe, legume velvety, pilose or glabrate at maturity; leaflets densely shortpubescent, elliptic, apex acute or rounded.......................................................................................................................... C. velutina

- Legume 6–13.5 × 2.5–4 cm, borne on stipe 7–10 mm long, or as long as the pedicel, legume, tomentose to puberulent when mature; leaflets elliptic-lanceolate to ovate-lanceolate, apex acute.................................................................................................................6

6 Leaflets elliptic-lanceolate, glabrous and shiny above, the lateral veins elevated above the blade surface, the margin thick, pubescent, or glabrous below; legume 4–15 × 2.5–4 cm, glabrate, stipe plus pedicel 16–20 mm long..................................... C. cubensis

- Leaflets ovate-lanceolate, densely pilose, to glabrate, dull above, lateral veins not elevated above the blade surface, the margin thin; fruit 6–10 × 2.5–3 cm, densely pilose to glabrate, stipe plus pedicel more than 20 mm long...................................... C. mollis