Evolvulus in Flora of North America @ efloras.org

2. Evolvulus Linnaeus, Sp. Pl. Ed. 2,. 1: 391. 1762.

Dwarf morning glory [Latin evolvo, not twisting, alluding to nontwining habit, as contrasted with Convolvulus]

Daniel F. Austin†

Annuals, perennials, or subshrubs. Stems ascending, decumbent, erect, procumbent, or prostrate, glabrous, glabrate, or hairy. Leaves: sessile or subsessile; blade elliptic, lanceolate, linear, oblanceolate, oblong, orbiculate, or ovate, 2–35 mm, surfaces glabrate, glabrous, or hairy. Inflorescences 2 or 3+-flowered cymes or flowers solitary. Flowers: sepals lance-linear, lanceolate, lanceolate-ovate, oblong, or ovate, 2–6 mm; corolla usually blue, lavender, purple, or white, rarely violet, campanulate, funnelform, or rotate, 3–15+ mm, limb 5-angled or -lobed to subentire, 5–12(–22) mm diam.; styles 2, distinct or basally connate, each 2-fid 1/2+ length; stigma lobes 4, filiform to subclavate. Fruits capsular, globose to ovoid, dehiscence circumscissle or valvate. Seeds 1–4, complanate to ± globose, glabrous, surfaces smooth or verrucose. x = 13.

Species ca. 100 (7 in the flora): North America, Mexico, West Indies, Central America, South America; introduced in Europe, Africa, Asia, Australia.

A record of Evolvulus nummularius (Linnaeus) Linnaeus for Florida is based on Rugel 108 (US), which is probably from Cuba (D. B. Ward 1968b).

SELECTED REFERENCES Austin, D. F. 1990. Comments on southwestern United States Evolvulus and Ipomoea (Convolvulaceae). Madroño 37: 124–132. Ooststroom, S. J. van. 1934. A monograph of the genus Evolvulus. Meded. Bot. Mus. Herb. Rijks. Univ. Utrecht 14: 1–267. Ward, D. B. 1968b. Contributions to the Flora of Florida—3. Evolvulus. Castanea 33: 76–79.

1 Peduncles plus pedicels filiform, (8–)12–50+ mm. (2)

+ Peduncles plus pedicels stout, 0–2(–5+) mm. (4)

2 (1) Herbage glabrous or sparsely hairy and glabrescent, hairs appressed; stems usually procumbent or prostrate, sometimes decumbent 1 Evolvulus convolvuloides

+ Herbage usually hairy, hairs ± appressed to spreading, sometimes tomentose; stems usually ascending, decumbent, or erect, rarely procumbent. (3)

3 (2) Leaf blades lanceolate, lance-linear, or linear; sepals lanceolate to lance-linear, 3–3.5 mm, abaxially pilose to tomentose; corolla limbs (10–)12–22 mm diam. 2 Evolvulus arizonicus

+ Leaf blades elliptic, lanceolate, oblong, or ovate; sepals lanceolate, 2–2.5 mm, abaxially glabrous or pilose; corolla limbs (5–)7–10 mm diam. 3 Evolvulus alsinoides

4 (1) Leaves distichous. (5)

+ Leaves pentastichous. (6)

5 (4) Stems decumbent to prostrate; leaf blades usually ovate to broadly ovate, sometimes suborbiculate, 5–8(–10) × 4–7 mm 4 Evolvulus grisebachii

+ Stems ascending or procumbent; leaf blades elliptic, lanceolate, oblong, or ovate, 4–25 × 2–10 mm 5 Evolvulus sericeus

6 (4) Internodes usually 4+ mm; leaf blades elliptic to linear; outer sepals ovate, 3–4 mm; rhizomatous perennial 6 Evolvulus arenarius

+ Internodes rarely 4+ mm; leaf blades usually elliptic, sometimes linear-oblong or narrowly lanceolate to oblanceolate, rarely oblong; outer sepals lanceolate to narrowly lanceolate, 4–5 mm; subshrub 7 Evolvulus nuttallianus

Lower Taxa

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