Anthemis rigida subsp. ammanthiformis (Greuter & Rechinger) Greuter, 1968

Goula, Katerina & Constantinidis, Theophanis, 2021, Taxonomic diversity and karyology of Anthemis rigida (Anthemideae, Asteraceae) in the Aegean, Greece, Phytotaxa 484 (1), pp. 129-143 : 140

Anthemis rigida subsp. ammanthiformis (Greuter & Rech.f.) Greuter (1968: 263)

Type:― GREECE. Insula Antikythera : Potamos, in parte boreali insulae, in saxosis calc. litoreis, 8 May 1964, Rechinger 24367a (holotype, W!) .

Annual with prostrate to ascending, simple or sparingly branched stems, 1.5−25 cm long. Stems and leaves greyishgreen, densely tomentose with medifixed hairs. Lower leaves long-petiolate, 2-pinnatisect, glandular-punctate; ultimate lobes obovate to obovate-lanceolate, subacute to shortly mucronate; upper leaves gradually smaller and less divided to simple. Peduncles thickened, becoming rigid in fruit. Capitula solitary, radiate. Involucre (3−)4−8 × 3−4.5(−5.5) mm, obconical to subhemispherical, bracts usually in 2−3 rows, imbricate, unequal in length, densely tomentose, thick and rigid in fruit. Outer involucral bracts lanceolate to narrowly oblong-lanceolate, 2−3 × ca. 1 mm, usually not more than 1/2−2/3 as long as inner bracts, with scarious margins up to 0.2 mm. Inner bracts lanceolate to obovate, 3−4.5(−5.5) × ca. 1.5 mm, with scarious margins up to 0.4 mm. Ligulate florets with ligules obovate, as long as or shorter than involucre, white, glandular punctate, sterile; disc florets yellow, glandular punctate. Anthers, style, and pollen yellow. Receptacular scales hyaline, obovate to oblanceolate, becoming lacerate. Achenes obconical to obpyramidal, faintly ribbed; outer achenes 1.8−2 mm, with a corona 0.5−0.6 mm long; inner achenes somewhat longer and thinner, 2−2.2 mm, with a corona 0.3−0.5 mm long.

Distribution and habitat:―This subspecies is endemic to Antikithira and the northern part of Gramvousa promontory, west Kriti, where it grows mostly on coastal habitats.