Talinum calycinum Engelm.

 

Origin and Habitat: Central southern United States (Illinois to Nebraska, Colorado, Kansas, Louisiana, Missouri, New Mexico, Oklahoma, Texas and Arkansas).
Altitude range: 100–1200 metres above sea level.
Habitat and ecology: Talinum calycinum grows on exposed edge of sandstone cliffs, on rocky soils, rocks and glades. It is found growing both singly or in large colonies in the wild, lately it is quite rare.

Common Names include:
ENGLISH: Large-flowered Flower-of-an-hour, fameflower, fame flower, rock pink

Description: Talinum calycinum is handsome succulent up to 40 cm talll that differs from other species of this genus in its larger flowers, larger capsules, and more numerous stamens. A tuft of short, flashy, finger-like leaves spring from the crown of the pinkish yellow, fleshy root. The flower is a bright rose colour filled with 30-45 golden stamen, seeming to float above the plant, as the stems are so fine and dark that they are nearly invisible. There are many buds in the loose sprays with a number of stems, so that, though the flowers open early in the afternoon and are short lived, the beautiful display lasts well from midsummer to first frost. A gentle breeze will set the flowers to dancing like hovering butterflies.
Derivation of specific name: Specific epithet means calyx-like.
Roots: Fleshily woody, carrot-like root that remains under the medium through the winter.
Stems: Ascending or erect, simple or branching.
Leaves: Sessile, sparse. Blade very narrow, linear, succulent-type, subterete, to 7 cm long. Foliage turns a beautiful bright pink before disappearing at first frost.
Inflorescences: Cymes atop leafless scapelike stems (peduncles) much overtopping basal clumps leaves, to 25 cm tall.
Flowers: Sepals persistent, ovate to suborbiculate, 4–6 mm; petals 5 to 8 pink- to red-purple, obovate, 10–15 mm. Stamens 25–45; stigma 1, subcapitate, 3-lobed.
Fruits (capsules): Broadly ovoid, 6–7 mm.
Seeds: Without arcuate ridges, 1 mm.
Phenology: In habitat this species flowers from may (spring) to september-october (fall). Flowers typically open at noon and remain open only until mid-afternoon.
Chromosome number: 2n = 24 (Some populations of Talinum calycinus are diploid while others are tetraploid, the latter probably the result of autopolyploidy)

https://www.llifle.com/Encyclopedia/SUCCULENTS/Family/Portulacaceae/33353/Talinum_calycinum