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| Orobanche andryalae C.J.Thorogood, M. Hernández González, Rumsey & Reyes-Bet.,
in Thorogood, Hernández González, Rumsey et Reyes-Betancort, 2025. |
Abstract
A new species of Orobanche is described from the Canary Islands. The plant belongs to the complicated Subsection Minores and has a distinct combination of morphological features, ecology, and host specificity. The markedly cernuous corolla, high filament insertion and colouration distinguishes Orobanche andryalae from closely related species with which it has been previously confused, and which do not occur in the Canary Islands, including O. amethystea subsp. castellana and O. calendulae; these features remain stable in cultivation. Orobanche andryalae appears to be parasitic almost exclusively on Andryala spp., and occurs on thermophilus volcanic substrates in northern Lanzarote, northwest Tenerife and Jandía in Fuerteventura. An updated key to the Orobanche of the Canary Islands is presented, including the new taxon we describe here.
Key words: Andryala, broomrape, endemism, Macaronesia, parasitic plant
Orobanche andryalae
A habit B lower stem C corolla D corolla cross section E carpel F stamen G calyx lobe H bract.
A habit B lower stem C corolla D corolla cross section E carpel F stamen G calyx lobe H bract.
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| A Orobanche andryalae in cultivation at the University of Oxford Botanic Garden B O. amethystea in the Algarve, Portugal C O. calendulae in the Algarve, Portugal D the habitat of O. andryalae in Lanzarote: volcanic cliffs (Famara area, northern Lanzarote) E O. andryalae in Lanzarote, with its host plant Andryala perezii F O. andryalae collected from Fuerteventura (putatively parasitising Asteriscus sericeus) G, H O. andryalae in northwest Tenerife growing on Andryala pinnatifida (the corolla dorsal line of the specimen in H is atypical in being less conspicuously cernuous). |
Orobanche andryalae C.J.Thorogood, M. Hernández González, Rumsey & Reyes-Bet., sp. nov.
Description: Stems 6–16(25) cm, glandular-hairy, pale orange to light reddish-brown. Stem scarcely swollen below; subterranean bracts broadly triangular, yellow; those above (reduced leaves) rather sparse, brown, 8–15 mm. Flowers 5–15(20), arranged on the upper quarter or third of the stem, lax. Bracts 10–12 mm, rather shorter than the corolla, broadly triangular, brown, glandular-hairy. Calyx 5–7 mm with segments fused, strongly unequal (rarely entire), not exceeding the corolla tube. Corolla 10–15 mm, pale yellow with faint reddish veins and scattered glandular hairs, strongly cernuous when mature, remaining so in fruit, sometimes abruptly geniculate; upper lip bilobed; lower lip 3-lobed, the lateral lobes slightly exceeding the central; all lobes minutely-toothed. Filaments sparsely hairy below, glabrous above; inserted conspicuously (c.5 mm) above the corolla base; anthers ± glabrous. Stigma lobes touching, mid to dark red-orange.
Etymology. Orobanche andryalae is named in accordance with its main host species, Andryala perezii.
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