Tuberaria

(Dunal) Spach

Ann. Sci. Nat., Bot., sér. 2, 6: 364. 1836.

Introduced
Etymology: Latin tuber, swelling, and -aria, possession, alluding to swellings on roots
Basionym: Helianthemum sect. Tuberaria Dunal in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 1: 270. 1824
Treatment appears in FNA Volume 6. Treatment on page 397. Mentioned on page 386, 387, 398.

Herbs annual [perennial], 0.3–2(–3)[–8] dm. Leaves mostly opposite, basal soon withering, sometimes in rosettes, distal cauline sometimes alternate, stipulate or estipulate, petiolate or sessile; blade usually 3[–5]-veined from base, margins sometimes revolute, surfaces hairy [glabrous], hairs sometimes clustered (stellate). Inflorescences racemiform [helicoid, scorpioid] cymes. Pedicels present; bracts [present or] absent. Flowers chasmogamous and cleistogamous, nodding or pendulous in bud. Chasmogamous flowers: sepals persistent, 5, outer smaller than [equaling] inner; petals 5, yellow, sometimes purple to brown at or near bases; stamens 10–15+; filaments distinct, outer stamens often sterile; carpels 3; styles 0; stigmas 1, ± sessile, hemispheric [obconic]. Cleistogamous flowers similar; petals 0; stamens 5–12. Capsules 3-valved. Seeds 6–50+ per capsule. x = 9.

Distribution

Introduced; Calif., c, w Europe, n Africa.

Discussion

Tuberaria differs from Crocanthemum and Helianthemum primarily in habit, mostly opposite leaves, and sessile or subsessile stigmas.

Species 8–12 (1 in the flora).

Selected References

None.

Lower Taxa