Stipa balansae H. Scholz

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

Stipa balansae H. Scholz ( Figure 58 (2)).

Lemma dorsal surface: Characterised by rectangular long cells of (20–)30–45(–54) × (4–)5–7(–9) µm, smooth walls, up to 3 µm thick, linear distribution. Short cells: main Silica cells of 8–12 × 5–10 µm, circular to reniform, occasionally oblong, sporadic and always in pairs or threes with a hook, occasionally with a cork cell, situated between long cells, never solitary; Cork cells 5–8(–9) × 5–9 µm, reniform, sporadic, always with a silica cell. Spines and hairs: Hooks reniform to occasionally circular base (7–)10–20(–27) × 4–7(–9) µm high, regularly distributed between long cells, in pairs or threes with silica, cork or additional hook cells, more frequently solitary, density 10–14 hooks/100 µm 2; Macro-hairs 400–600(–750) µm long, circular base 8–21(–24) µm, regularly distributed in lines from mid-dorsal area to base of lemma.

Lemma apical surface: Characterised by long cells similar to those of the dorsal area, slightly shorter up to 50 µm. Short cells: Silica cells of 8–14 × 6–12 µm, more frequent and of similar morphology to the dorsal; Cork cells absent. Spines and hairs: Hooks circular to reniform base (5–)10–27(–35) × 10–25 µm, denser than in dorsal area 16–20 hooks/100 µm 2; Prickles circular base 25–35 µm and up to 150 µm long, distributed in middle of apex, density 2–8/100 µm 2; Macro-hairs of circular base 28–37(–41) µm and up to 370 µm long, located at distal part of apex.

Material studied: Morocco: Debdou, -306636/ 3386655, 1530 m.s.a.l., 4-VI-2018, M. Chambouleyron ( ECWP s.n. (HSSrf 150)); Maatarka, 0551262/ 3629341, 1390 m.s.a.l., 13-V-2015, M. Chambouleyron ( ECWP s.n. (HSSrf 214)) .

Figures

FIGURE 58. Lemma surface of Stipa × alba (1) and Stipa balansae (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.