[Botany • 2022] Artemisia calcicola (Asteraceae: Anthemideae) • A New Species from Karst Region in Guizhou, southwestern China

 Artemisia calcicola X.Q.Guo & L.Wang, 

in Li, Chi, Guo & Wang. 2022.

  灰岩蒿  ||  DOI: 10.3897/phytokeys.213.96203

Abstract

Artemisia calcicola (Asteraceae, Anthemideae), a new species from karst region in Shibing county, Guizhou province, southwestern China, is described and illustrated. The species can be readily assigned to A. subg. Artemisia in having fertile disk florets and glabrous receptacles. Within this subgenus, A. calcicola is distinguished by having (2- or) 3-pinnatipartite leaves and narrowly ellipsoid involucres 0.9–1.3 mm in diameter. It resembles A. annua to some extent, but differs immediately by the plant duration, stem and leaf indumentum, and involucre shape and size. A detailed description and distribution map of this species are also provided herein.

Keywords: Compositae, limestone flora, morphology, taxonomy

Artemisia calcicola sp. nov.
 A habitat and habit B leaf rosette of a vegetative branch C portion of stem D leaves E adaxial side of leaf F abaxial side of leaf G portion of synflorescence H capitula I phyllaries (abaxial side) J receptacle K marginal female florets L disk florets.

 All photographs by Long Wang.

 

 Artemisia calcicola X.Q.Guo & L.Wang, sp. nov.

 

Diagnosis: Artemisia calcicola is distinguished within the A. subg. Artemisia in having (2- or) 3-pinnatipartite leaves and narrowly ellipsoid involucres 0.9–1.3 mm in diameter. Within this subgenus, it is merely superficially similar to A. annua in having (2- or) 3-pinnatipartite stem leaves, ovate-acuminate or ovate, entire or (1- or) 2-toothed leaf lobules, and a narrow to broad panicle-like synflorescence, but differs by being perennial and by having arachnoid-tomentose stems and leaves and narrowly ellipsoid involucres 0.9–1.3 mm in diameter (a detailed morphological comparison between the two species is given in Table 1).

Etymology: Latin calcis, genitive singular of calx, limestone, and cola, dweller, alluding to habitat on calcareous cliffs.

 

Vernacular name: 灰岩蒿 (Chinese pinyin: huī yán hāo).

Cheng-Sheng Li, Xiao-Rui Chi, Xin-Qiang Guo and Long Wang. 2022. Artemisia calcicola (Asteraceae, Anthemideae), A New Species from Karst Region in Guizhou, southwestern China. PhytoKeys. 213: 161-167. DOI: 10.3897/phytokeys.213.96203