Phemeranthus rugospermus

Plants to 2.5 dm; roots elongate, fleshily woody. Stems ± erect, simple or sometimes branching. Leaves sessile; blade terete, to 6 cm. Inflorescences cymose, much overtopping leaves; peduncle scapelike, to 15 cm. Flowers: sepals deciduous, ovate, 4 mm; petals pink to magenta, ovate to obovate, sometimes mucronulate, 6.5–8 mm; stamens 12–28; stigmas 3, spreading widely, linear, 1/2–1/3 as long as styles. Capsules subglobose, 4 mm. Seeds without arcuate ridges, 1.2 mm, corrugate-rugulose overall. 2n = 24.

Phenology: Flowering May–Aug.
Habitat: Sand or sandy soils, dunes, mounds, flats, banks, ridges, edges of igneous or metamorphic rock outcrops, along or near watercourses
Elevation: 0-500 m

Distribution

• Generated Map
• Legacy Map

Ill., Ind., Iowa, Kans., La., Minn., Nebr., Tex., Wis.

Discussion

Within the overall area of its distribution, Phemeranthus rugospermus is nowhere abundant, its occurrence being everywhere spotty and localized. According to T. S. Cochrane (1993), the disjunctions probably reflect a history of long-distance dispersal from a center in the partially unglaciated Kansas and Nebraska sandhills, the present-day gaps resulting from a paucity of suitable habitats between that area and the others where it is now found. Even so, its discovery in Missouri, Arkansas, and/or Oklahoma would not be surprising.

Selected References

Cochrane, T. S. 1993. Status and distribution of Talinum rugospermum Holzinger (Portulacaceae). Nat. Areas J. 13: 33–41.

MacRoberts, M. H. and B. R. MacRoberts. 1997. Talinum rugospermum Holzinger new to Louisiana with notes on terete-leaved Talinum in Louisiana. Phytologia 82: 86–93.

Lower Taxa

None.