Stipa barbata subsp. barbata Desf., 1798

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 : 103-105

Stipa barbata subsp. barbata Desf. ( Figure 59 (1)).

Lemma dorsal surface: Characterised by long rectangular cells of (17–)25–50(–60) × 4–8 µm, smooth walls, up to 3 µm thick, linear distribution. Short cells: Silica cells of 7–11 × 12–20 µm, rectangular to circular, occasionally oblong, frequent, in pairs or threes with a cork cell, situated between long cells, never solitary; Cork cells 6–11(–15) × 5–9 µm, circular to reniform, sporadic, always with a silica cell. Spines and hairs: Hooks circular to obovate base (6–)8– 17(–24) × 4–8(–9) µm high, regularly distributed between long cells, in pairs or threes with silica, cork or additional hook cells, frequently solitary, density 10–12 hooks/ 100 µm 2; Prickles circular base 20–34 µm, up to 140 µm long, irregularly distributed in dorsal area, and up to 3 prickles/100 µm 2; Macro-hairs of circular base 20–35(–38) µm and 800–1100(–1300) µm long, irregularly distributed.

Lemma apical surface: Characterised by long cells identical to those of the dorsal area. Short cells: Silica and cork cells of similar morphology, size and distribution to those of dorsal area, less frequently cork cells. Spines and hairs: Hooks circular base frequent, less obovate, equal in size and distribution to dorsal area, denser than on the dorsal area 14–17 hooks/100 µm 2; Prickles equal size and morphology to dorsal base and up to 130 µm long, distributed at middle of apex; Macro-hairs similar to those of dorsal area, to 1700 µm long, often reaching 1000 µm in length, located at distal part of apex.

Material studied: Morocco: Agadir Taliwine, Melloul, -781524/3026969, 1740 m.s.a.l., 21-II-2019, M. Chambouleyron ( ECWP s.n. (HSSrf 290)); Air Bri Makhar, 0502717/3756414, 1630 m.s.a.l., 1-VI-2012, M. Chambouleyron ( ECWP s.n. (HSSrf 65).

Figures

FIGURE 59. Lemma surface of Stipa barbata.subsp. barbata (1) and Stipa barbata. subsp. brevipila (2). A. Lemma central dorsal surface view. B. Lemma margin dorsal surface view. C. Lemma apical surface. lc. Long cell. sc. Silica cell. cc. Cork cell. h. Hook. p. Prickle. mh. Macro-hair. Bars indicate 100 µm.