Stipa lagascae Roemer & Schultes

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 : 107-108

Stipa lagascae Roemer & Schultes ( Figure 61 ).

Lemma dorsal surface: Characterised by rectangular long cells of (10–)20–45(–50) × 10–18(–20) µm in dorsal area and 25–50(–60) × 8–15 µm at margins, smooth to undulate walls, up to 4 µm thick at margin and up to 6 µm thick in the dorsal, linear distribution. Short cells: Silica cells not observed; Cork cells not observed. Spines and hairs: Hooks circular to reniform base 15–28 × 6–10 µm high, regularly distributed between long cells, frequently solitary, occasionally a pair of hooks, density 9–12 hooks/100 µm 2; Macro-hairs 350–450(–515) µm long, circular base (20–)25–35 µm, regularly distributed in lines from media dorsal area to base of lemma.

Lemma apical surface: Characterised by similar long cells to those of the dorsal area, slightly shorter 12–28(–32) × 10–20(–21) µm. Short cells: Silica cells fusiform, occasional, in pairs with hooks, 5–10(–11) × 12–20 µm; Cork cells not observed. Spines and hairs: Hooks equal in size and morphology to the dorsal, irregular distribution, at similar density than in the dorsal area (8–12 hooks/100 µm 2); Prickles of two types: Short up to 12 µm long in first basal section of apex lemma, and Medium of more than 15 µm in terminal basal section of apex lemma, density 1–3 prickles/100 µm 2; Macro-hairs ovoid base (18–)20–40 × 45–50(–60) µm and up to 410 µm long, distributed at middle and distal parts of apex.

Material studied: Morocco: Air Bri Mahkan, Merija,0534575/3769225, 1280m.s.a.l., 8-V-2012, M . Chambouleyron ( ECWP s.n. (HSSrf 238)); Bou Iblane, Tamtroucht, 1910 m.a.s.l., 4-VI-2019, M . Chamboleyron , ECWP n.n.

Figures

FIGURE 61. Lemma surface of Stipa lagascae. A. Lemma apex dorsal surface view. B. Lemma central dorsal surface view. C. Lemma basal dorsal surface view. D. Apex lemma and base column awn view. E. Awn fraction view. lc. Long cell. sc. Silica cell. h. Hook. p. Prickle. mh. Macro-hair. Bars indicate 100 µm.