Stipa letourneuxii var. letourneuxii Trab., 1890

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 letourneuxii var. letourneuxii Trab. ( Figure 3 (1)).

Lemma dorsal surface: Characterised by rectangular to sub-quadrangular long cells of (15–)18–40(–44) × 22–31 µm, smooth walls up to 10 µm thick, linear distribution. Short cells: main Silica cells 8–15 × 18–22 µm, circular to oblong, sporadic, more frequent at margin, frequently in pairs or threes with hook cells, situated between long cells, occasionally solitary; Cork cells 4–8 × 19–24 µm oblong to fusiform, sporadic, mostly with a silica cell or occasionally a hook cell. Spines and hairs: Hooks circular to sub-quadrangular base 12–22 × 6–9(–10) µm high, regularly distributed between long cells, in pairs or threes with silica, or additional hook cells, more frequent solitary, density 7–10 hooks/100 µm 2; Prickles not studied; Macro-hairs up to 450 µm long, circular base 10–18 µm, regularly distributed in lines from base to mid-dorsal surface.

Lemma apical surface: Characterised by long cells similar to those of the dorsal area, smaller 10–25 × 8–12 µm. Short cells: Silica cells of equal size and morphology to the dorsal, more frequent; Cork cells of equal size, distribution and morphology to the dorsal. Spines and hairs: Hooks equal in size, and morphology to the dorsal, irregular in distribution and at a higher density (28–32 hooks/100 µm 2); Prickles circular to ovate base, 18–21 × 19–25 µm, 15–55 µm long, distributed at middle and distal parts of apex, up to 3 prickles/ 100 µm 2; Macro-hairs not studied.

Material studied: Morocco: Aroval, 0500207/3636790, 1420 m.s.a.l., 9-V-2017, M. Chambouleyron ( ECWP s.n. (HSSrf 142 (1/2); Bouarfa, 0640778/3609597, 1270 m.s.a.l., 10-IV-2017, M. Chambouleyron ( ECWP s.n. (HSSrf 143 (1/2).

Figures

FIGURE 3. Gynoecium diversity in North African Stipeae. 1. Achnatherum Calamagrostis subsp. mesatlasicum. 2. Stipa letourneuxii. 3. Stipa balansae. 4. Stipa almeriensis. 5. Stipa barbata. 6. Macrochloa gabesensis. 7. Stipa juncea. 8. Stipellula parviflora. Bar indicates 1 mm.