Commelina diffusa |
Commelina erecta |
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climbing dayflower, spreading dayflower |
erect dayflower, whitemouth dayflower |
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Habit | Herbs, perennial or annual, spreading. | Herbs, perennial. | ||||
Roots | fleshy, stout, tufted. |
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Stems | decumbent to scandent. |
cespitose, usually erect to ascending (rarely decumbent, rooting at nodes). |
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Leaves | blade narrowly lanceolate to lanceolate-oblong, lanceolate-elliptic or ovate, 1.5–14 × 0.5–3.3 cm, margins scabrous, apex acute to acuminate, glabrous. |
leaf sheath auriculate at apex; blade sessile or petiolate, linear to lanceolate (rarely lanceolate-ovate), 5–15 × 0.3–4 cm, apex acuminate (rarely acute). |
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Inflorescences | distal cyme 1–several-flowered, usually exserted; spathes solitary, bright green, without contrasting veins, pedunculate, usually distinctly falcate, (0.5–)0.8–4 × 0.4–1.2(–1.4) cm, margins distinct, glabrous or scabrous, sometimes also sparsely ciliate or ciliolate basally, apex usually acuminate, usually glabrous or nearly so; peduncles 0.5–2(–4) cm. |
distal cyme vestigial, included; spathes solitary or clustered, green, pedunculate, not at all to strongly falcate, 1–2.5(–4) × 0.7–1.5(–2.5) cm, margins longly connate, glabrous except along connate edge, apex acute to acuminate, sometimes purple, usually variously pubescent; peduncles 0.5–1(–2) cm. |
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Flowers | bisexual and staminate; petals all blue (rarely all lavender), proximal petal smaller; medial stamen anther connective usually with transverse band of violet; staminodes 2–3; antherodes yellow, medial often absent or vestigial, cruciform. |
bisexual and staminate, 1.5–4 cm wide; proximal petal minute, white, distal petals blue (rarely lavender or white); staminodes 3, staminodes and medial stamen entirely yellow; antherodes cruciform. |
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Capsules | 3-locular, 2-valved, 4–6.3 mm. |
3-locular, 2-valved (very rarely 3-valved), 3.5–4.5 × 3–5 mm; abaxial locule warty, indehiscent (very rarely smooth and dehiscent); adaxial locules smooth, dehiscent. |
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Seeds | 5 (or less through abortion), brown, 2–2.8(–3.2) × 1.4–1.8 mm, deeply reticulate. |
3, brown, with soft, whitish tissue at both ends or in a band, 2.4–3.5 × 2.3–2.8 mm, nearly smooth. |
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2n | = 60. |
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Commelina diffusa |
Commelina erecta |
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Phenology | Flowering spring–fall. | |||||
Habitat | Rocky woods and hillsides, scrub oak woods, pine woods and barrens, sand dunes, hummocks, shale barrens, roadsides, railroad rights-of-way, fields, and occasionally a weed in cultivated ground | |||||
Distribution |
AL; AR; DC; FL; GA; IL; IN; KS; KY; LA; MD; MO; MS; NC; OH; OK; SC; TN; TX; VA; Pantropical
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AL; AR; AZ; CO; DC; DE; FL; GA; IA; IL; IN; KS; KY; LA; MD; MO; MS; NC; NE; NJ; NM; NY; OK; PA; SC; TN; TX; VA; WI; WV; Central America
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Discussion | The name Commelina nudiflora Linnaeus has been incorrectly used for this species. Varieties 4 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Commelina erecta grows in temperate regions of North and Central America, as well as in tropical regions. This is by far the most variable species of Commelina in the flora. Three freely intergrading varieties may be recognized, although they are of questionable significance: C. erecta var. erecta, with larger leaves lanceolate to lanceolate-ovate, (1.5–)2–4 cm wide, and spathes (2.2–)2.5–3.6 cm, occurs throughout our region; C. erecta var. angustifolia (Michaux) Fernald, with leaves linear to narrowly lanceolate, 0.3–1.5 cm wide, and spathes 1–2 cm, is mainly southern but extends as far north as Virginia; and C. erecta var. deamiana Fernald, with leaves linear to narrowly lanceolate, 0.5–1.7 cm wide, and spathes 2–3.5 cm, occurs in midwestern United States south to Texas. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 22. | FNA vol. 22. | ||||
Parent taxa | Commelinaceae > Commelina | Commelinaceae > Commelina | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | C. angustifolia, C. crispa, C. elegans | |||||
Name authority | Burman f.: Flora Indica. nec non Prodromus Florae Capensis 18, plate 7, fig. 2. (1768) | Linnaeus: Sp. Pl. 1: 41. (1753) | ||||
Web links |