Stipa trabutiana F.M. Vázquez

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 : 109

Stipa trabutiana F.M. Vázquez ( Figure 62 (2)).

Lemma dorsal surface: Characterised by rectangular long cells of 18–50 × 18–22 µm in dorsal area and 38–51 × 18–21 µm at margins, fine sinuous walls, thickness 3–6 µm, linear distribution. Short cells: main Silica cells of 8–12 µm, circular to obovate, sporadic, more frequent at margin, mostly in pairs or threes a hook, occasionally with a cork cell, situated between long cells, never solitary; Cork cells 8–11 × 5–11 µm, circular to reniform, sporadic, with a silica cell or very occasionally a hook cell (1/1000 cases). Spines and hairs: Hooks circular base 9–13 × 6–9(–10) µm high, regularly distributed between long cells, in pairs or threes with silica, cork or additional hook cells, more frequently solitary, density 12–15 hooks/ 100 µm 2; Prickles ovate to circular base 20–26 × 20–28 µm and 40–150 µm long, between macro-hairs, distributed across entire surface, up to 2 prickles/100 µm 2; Macro-hairs 200–380 µm long, obovate base 30–37 × 21–25 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 11–37 × 8–18 µm. Short cells: Silica cells equal in size and morphology to the dorsal, more frequent; Cork cells equal in size and morphology to the dorsal, more frequent. Spines and hairs: Hooks of equal size, density and morphology to the dorsal, irregular distribution; Prickles equal in base and size, up to 85 µm long, distributed in the middle and at the distal end of the apex up to 6 prickles/100 µm 2; Macro-hairs similar in size and morphology to dorsal, mostly located at distal part of apex.

Material studied: Morocco: Mengoub, 0551937/3565098, 30-III-2007, 1000 m.s.a.l., M . Chambouleyron ( HSS82619 ) .

Figures

FIGURE 62. Lemma surface of Stipa maroccana. (1) and Stipa trabutiana (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.