Stipa apertifolia Martinovsky, 1967

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 : 100

Stipa apertifolia Martinovsky ( Figure 56 (2)).

Lemma dorsal surface: Characterised by rectangular to quadrangular long cells of (12–)18–35(–42) × 14–18 µm, sinuous walls, 2–8 µm thick, linear distribution. Short cells: main Silica cells 7–12 × (10–)12–18 µm, circular, oblong to sub-quadrangular, sporadic and in pairs or threes with a hook or occasionally a cork cell, situated between long cells, never solitary; Cork cells 8–10(–12) × 5–9 µm, circular to fusiform, sporadic, always with a silica cell. Spines and hairs: Hooks circular to ovoid base 8–16(–17) × 12–18 µm high, regularly distributed between long cells, in pairs or threes with silica, cork or additional hook cells, more frequently solitary, density (12–)14–16 hooks/100 µm 2; Prickles not studied; Macro-hairs> 650 µm long, circular base 10–18(–20) µm, 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 110 µm and 6 µm thick, sinuous wall, and surface flat to concave. Short cells: Silica cells of 7–14 × 9–15 µm, more frequent in dorsal area, similar morphology; Cork cells 5–8 × 8–12 µm, oblong to sub-reniform, more frequent in dorsal area. Spines and hairs: Hooks, circular base 10–18 µm, lower density in dorsal area (8–)9–12 hooks/100 µm 2; Prickles absent; Macro-hairs> 600 µm long, of obovate to circular base, located at margin area up to apex.

Material studied: Spain: Granada , Granada , Sierra Nevada, Dornajo, 2100 msnm, 7-VI-1991, D. & F. M . Vázquez, HSS003002 .

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.