Aichryson santamariensis M.Moura, Carine & M.Seq., 2015
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publication ID |
https://doi.org/ 10.11646/phytotaxa.234.1.2 |
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persistent identifier |
https://treatment.plazi.org/id/762D87C6-7111-FFE3-FF43-364CFD2A7A5A |
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treatment provided by |
Felipe |
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scientific name |
Aichryson santamariensis M.Moura, Carine & M.Seq. |
| status |
sp. nov. |
Aichryson santamariensis M.Moura, Carine & M.Seq. View in CoL , sp. nov. ( Figure 4 View FIGURE 4 )
= Sempervivum villosum auct . fl. Azorica.
= Aichryson villosum auct . fl. Azorica.
Type:— PORTUGAL. Azores: Santa Maria, Ponte dos Agriões, 669943,4093793 UTM, 330 m, 12 June 2011, Mónica Moura AI-MAAG- 3 to 7 (holotype AZB2313 [AI-MAAG-003], isotypes: AZB2314 [AI-MAAG-004], AZB2315 [AI-MAAG-005], AZB2316 [AI- MAAG-006], BM [AZB2317, AI-MAAG-007]).
Ab Aichryso villoso pleroque minore magnitudine, caulibus glabris vel pubescentibus, ipso foliis minoribus crenatisque (immo in A. villoso integris ) glabris sive pilis usque ad 0.63 mm longis habendis (dum A. villoso 0.70–2.23 mm); saepe inflorescentiis floris paucis quarum pedicellis petalisque brevitissime pilosis usque 0.39–0.67 mm longitudine (immo in A. villoso 0.65–1.26 mm) differt.
Annual or biennial herb up to 19 cm tall ( Figure 5 View FIGURE 5 ), simple or scarcely branched. Stem 0.77–2.66 mm in diameter, greenish but sometimes reddish below at anthesis, puberulous-pubescent, glabrous below. Leaves ( Figure 4B View FIGURE 4 ), obtrullate 5.68–15.68 × 2.10–8.67 mm, the widest point 0.60–0.75 of total length from the base, glabrous to glandular-pubescent, shortly hairy with hairs up to 0.63 mm long on the adaxial surface and up to 0.55 mm long on the abaxial surface, green (suffused with red); margin crenulate; apex rounded to acute. Inflorescence a lax panicle, 1–3 branched, usually with 5–20 flowers; rarely many flowered (up to ca. 100); branches densely glandular-pubescent, with hairs 0.41–0.87 mm long. Bracts spathulate to oblanceolate; pedicels 2.80–12.20 mm, pubescent with hairs 0.39–0.67 mm. Flowers 8–9- merous; calyx segments divided into ovate-lanceolate acuminate segments 2.67–3.59 × 1.12–1.48 mm, widest toward the base (0.37–0.48 of total length), shortly pubescent on the apex, villous to the base with a few long hairs 0.41–0.96 mm. Petals golden yellow, ovate-elliptical (seldom lanceolate), 3.97–5.61 × 1.26–2.16 mm, 1.3–1.8 times longer than the sepals; abaxially shortly puberulous (hairs 0.10–0.31 mm); apex shortly mucronate. Stamens glabrous, filaments 2.8–3.6 mm, anthers 0.38–0.54 × 0.35–0.49 mm. Carpels 2.7–4.6 × 1.0– 1.7 mm, adaxially with a few hairs 0.33–0.97 mm long; style 1.11–1.53 mm long; hypogynous scales 0.48–0.85 mm, palmate with lacinia 0.10–0.24 mm. Seeds 0.42–0.51 × 0.23–0.30 mm (width/length ratio 0.52–0.65).
Phenology: —Flowering April to June.
Distribution and ecology: — Aichryson santamariensis is endemic to Santa Maria in the Azores where it is relatively widespread and known from all areas except the dry, eastern plain and the highest mountains (Schaefer 2002). It occurs from coastal areas up to 500 m, but is most frequent between 100–200 m and is found on steep roadsides, rocky slopes, cliffs and walls as a chasmophyte or comophyte, mostly in xeric habitats but sometimes in more humid conditions.
Conservation: —The species was considered not endangered by Schaefer (2002) and applying the IUCN (2001) criteria, it should be considered Least Concern (LC). Although common, populations on roadsides are vulnerable to repeated disturbance by maintenance work. This is particularly important because A. santamariensis is a therophyte, and thus population renewal is only possible if the cutting of vegetation does not impede seed set. This should be considered in the planning of maintenance work.
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