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cultivated purslane, moss-rose, rock rose, rose moss

shrubby purslane

Habit Plants annual; roots fibrous. Plants perennial; roots tuberous.
Stems

prostrate to suberect;

trichomes conspicuous at nodes and in inflorescence;

branches to 30 cm.

stiffly erect, suffrutescent;

trichomes conspicuous at nodes and in inflorescence;

branches (8–)15–30 cm.

Leaf

blades linear to lanceolate, terete to hemispheric, 5–30 × 1–5 mm, apex acute or subacute; involucrelike leaves 8–9(–14).

blades linear, terete, (4–)8–20(–30) × 0.5–2.8 mm, apex acute to subacute; involucrelike leaves 6–9.

Flowers

25–55 mm diam.;

petals pink, red, purple, yellow, bronze, or white, obovate, 15–25 × 15–20 mm;

stamens 40 or more;

stigmas 5–8.

25 mm diam.;

petals orange, brown-orange, copper, or bronze, color often deepening at base, obcordate or emarginate, 7–12 × 4–5.5 mm;

stamens 25–35;

stigmas 4–7(–8).

Capsules

ovoid, (3.5–)4–6.5 mm diam.

subglobose, 2.5–5 mm diam.

Seeds

steely gray, often iridescent, orbiculate or elongate, flattened, 0.75–1 mm diam.;

surface cells obscurely stellate with tubercles mostly abaxially.

leaden, slightly iridescent, 0.5–0.65 mm;

surface cells loosely arranged in distinct rows, raised, stellate, tubercles usually present.

2n

= 18.

= 8.

Portulaca grandiflora

Portulaca suffrutescens

Phenology Flowering late spring–fall. Flowering spring–late summer.
Habitat Sandy soils Rocky slopes, flats, grasslands, roadsides, sandy or gravelly soils along streams
Elevation 0-2000 m (0-6600 ft) 900-2100 m (3000-6900 ft)
Distribution
from FNA
AL; AR; AZ; CA; CO; CT; DC; DE; FL; GA; IA; IL; IN; KS; KY; LA; MA; MD; MI; MN; MO; MS; NC; ND; NE; NH; NJ; NM; NV; NY; OH; OK; PA; RI; SC; SD; TN; TX; VA; VT; WI; WV; ON; South America; naturalized in Europe [Introduced in North America]
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; NM; TX; n Mexico
[WildflowerSearch map]
[BONAP county map]
Discussion

Portulaca grandiflora is naturalized in gardens and has escaped to roadsides and waste places. Studies of seed surfaces from specimens representing 100 years of collections with distribution over the United States show remarkable consistency in seed morphology. Tubercles may extend onto the lateral surface, where they are widely scattered. Only one specimen was found with no tubercles at all.

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

In the nonflowering condition, Portulaca suffrutescens resembles P. pilosa, although P. suffrutescens is stiffly erect. Another characteristic of this species is elongation of the internodes such that the overall impression of density of trichomes appears to be less than in P. pilosa. This feature will not be apparent in immature plants, or in those growing in dry conditions in which little internode elongation may have taken place. Immature seeds appear black, with rounded tubercles on the abaxial spine.

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

Source FNA vol. 4, p. 498. FNA vol. 4, p. 500.
Parent taxa Portulacaceae > Portulaca Portulacaceae > Portulaca
Sibling taxa
P. amilis, P. biloba, P. halimoides, P. oleracea, P. pilosa, P. rubricaulis, P. smallii, P. suffrutescens, P. umbraticola
P. amilis, P. biloba, P. grandiflora, P. halimoides, P. oleracea, P. pilosa, P. rubricaulis, P. smallii, P. umbraticola
Name authority Hooker: Bot. Mag. 56: plate 2885. (1829) Engelmann: Bot. Gaz. 6: 236. (1881)
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