Stipa almeriensis F.M. Vázquez, 2006

Vázquez, Francisco Maria, Márquez, Francisco, García, David & Oualidi, Jalal El, 2025, A taxonomic revision of Stipeae s. l. tribe (Poaceae) in N Africa, Phytotaxa 699 (1), pp. 1-174 : 99-100

Stipa almeriensis F.M. Vázquez ( Figure 56 (1)).

Lemma dorsal surface: Characterised by long rectangular cells of (10–)16–65(–81) × 10–18(–24) µm, surface concave to flat, sinuous walls up to 9 µm thick, linear distribution. Short cells: Silica cells of 8–16 × 8–12 µm, circular to obovate, occasional and in pairs with hook or in threes with hook and cork cells, situated between long cells, never solitary; Cork cells (2–)3–8(–12) × 8–12 µm, fusiform to arched, with a silica cell, sporadic. Spines and hairs: Hooks with short points (blunt), circular base 10–20(–24) × <2 µm high, regularly distributed between long cells, in pairs or threes with silica and cork cells, occasionally solitary, density 12–18 hooks/100 µm 2; Macro-hairs circular base 3–(–7) µm, more than 600 µm long, regularly distributed in lines from mid-dorsal to base of lemma.

Lemma apical surface: Characterised by long cells similar to those of the dorsal area, slightly longer up to 100 µm and up to 11 µm thick, sinuous wall. Short cells: Silica cells of 7–12 × 4–7 µm, similar distribution to those of dorsal part, but ovate to oblong morphology; Cork cells (2–)3–6 × 5–10 µm, oblong to sub-reniform (fewer), more frequent in the dorsal area. Spines and hairs: Hooks unpointed, ovate base 7–12(–14) × 5–9 µm, lower density than in dorsal area 6–10 hooks/100 µm 2; Prickles absent; Macro-hairs of obovate to circular base, located at margin leading up to apex.

Awn base surface: Characterised by long cells of acute to oblique apex up to 290 µm in twisted, flat and angled parts. Short cells absent. Spines and hairs: Hooks absent; Prickles absent; Macro-hairs absent. Stomata paracytic (Parallel-sided subsidiary cells type), of linear distribution in flat parts and in groove between twists, density 40–80(– 100) stomata/ 1 cm 2.

Material studied: Spain: Granada, Albuñuelas, sierra de Albuñuelas, 1356 msnm, 4-VI-2022, L . Concepción, D. M. & F. M . Vázquez HSS80853 .

Figures

FIGURE 56. Lemma Surface Stipa almeriensis. (1) and Stipa apertifolia (2). A. Lemma central dorsal surface view. B. Lemma margin dorsal surface view. C. Lemma apex. D. Awn surface. lc. Long cell. sc. Silica cell. cc. Cork cell. h. Hook. p. Prickle. mh. Macro-hair. s. stomata. Bars indicate 100 µm.