Stylisma in Flora of North America @ efloras.org

7. Stylisma Rafinesque, Amer. Monthly Mag. & Crit. Rev. 3: 101. 1818.
[E]

[Greek stylos, pillar, and –skhísma, division, alluding to cleft style]

Charles M. Allen

Perennials. Stems usually procumbent or trailing, rarely twining, glabrous or hairy, hairs 2-armed. Leaves petiolate or sessile; blade linear to oblong-elliptic, 10–80 mm, surfaces glabrous or hairy. Inflorescences 2–7-flowered or flowers solitary. Flowers: sepals ovate-lanceolate to ovate, 4–11 mm; corolla usually white, sometimes lavender, maroon, pink, purple, or red, campanulate or funnelform, 8–25 mm, limb 5-angled or -lobed; styles 2, connate at base or nearly to tips; stigmas peltate. Fruits capsular or nutlike, dry, oblong-ovoid [ellipsoid, fusiform, turbinate], dehiscence valvate. Seeds 1(–4), ovoid [ellipsoid, fusiform, or globose], hairy. x = 14.

Species 6 (6 in the flora): c, se United States.

SELECTED REFERENCES Allen, C. M. 2013. Synopsis of the genus Stylisma (Convolvulaceae) in Louisiana. J. Bot. Res. Inst. Texas 7: 515–516. Myint, T. 1966. Revision of the genus Stylisma (Convolvulaceae). Brittonia 18: 97–117.

1 Leaf blades 10–18 mm; flowers: sepals 4–6 mm, corollas 8–13 mm 1 Stylisma abdita

+ Leaf blades 20–80 mm; flowers: sepals 4–11 mm, corollas 10–25 mm. (2)

2 (1) Corollas lavender, maroon, pink, purple, or red; stamens: filaments glabrous or glabrate 2 Stylisma aquatica

+ Corollas white; stamens: filaments usually hairy, at least proximally, rarely glabrous. (3)

3 (2) Leaf blades 10–30 mm wide; inflorescences usually 3–7-flowered, flowers rarely solitary. (4)

+ Leaf blades 0.1–8 mm wide; inflorescences: flowers usually solitary, sometimes 2–5-flowered. (5)

4 (3) Sepals glabrous 3 Stylisma humistrata

+ Sepals densely villous 4 Stylisma villosa

5 (3) Leaf blades 0.1–3 mm wide; bracteoles 15–25 mm; style branches usually connate (1/2–)5/6+ length, sometimes less 5 Stylisma pickeringii

+ Leaf blades 2–8 mm wide; bracteoles 1–3(–5) mm; style branches connate only at base 6 Stylisma patens

Lower Taxa