Kunth in A. von Humboldt et al.

in A. von Humboldt et al., Nov. Gen. Sp. 6: 77, plate 526. 1823

Etymology: For J. L. Calandrini, 1703–1758, Swiss botanist
Treatment appears in FNA Volume 4. Treatment on page 459. Mentioned on page 458, 461.
Herbs, annual, not rhizomatous or stoloniferous. Stems prostrate to erect, branched; nodes glabrous. Leaves alternate, not articulate at base, somewhat to markedly clasping, attachment points linear; blade linear to oblanceolate, or ovate to spatulate, flattened, glabrous or with elongate unicellular hairs. Inflorescences racemose, somewhat to markedly secund (at least distally), elongate, bracteate; bracts leaflike. Flowers pedicellate; sepals persistent in fruit, imbricate, green, distinctly angled or keeled, ovate, herbaceous, glabrous or with elongate, unicellular hairs; petals usually 5, red; stamens 3–15, usually opposite petals, not adnate to petals; ovules 6–many; style present; stigmas 3. Capsules 3-valved, longitudinally dehiscent from apex, valves not deciduous, reflexed after dehiscence, margins markedly involute; endocarp and exocarp not separating. Seeds 10–20, black, ± ellipsoid, reticulate or tuberculate viewed at 30×, glabrous, estrophiolate. x = 12.


Temperate w Americas, with greater diversity in w South America.


Species 14 (2 in the flora).


1 Capsules usually exceeding calyx by 3+ mm; seeds at 30× partially or totally finely tuberculate Calandrinia breweri
1 Capsules usually not exceeding calyx by 3+ mm; seeds at 30× finely reticulate Calandrinia ciliata