Stipa juncea, Linnaeus, 1753

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 : 106

Stipa juncea L. ( Figure 60 (2)).

Lemma dorsal surface: Characterised by rectangular long cells of (22–) 25–37(–41) × 18–22 µm, smooth walls, 2–8 µm thick, linear distribution. Short cells: main Silica cells of 8–12 × 7–10 µm, circular to reniform, occasionally oblong, sporadic and in pairs or threes with a hook, or occasionally a cork cell, situated between long cells, never solitary; Cork cells 10–12 × 7–11 µm, reniform to circular, sporadic, always with a silica cell. Spines and hairs: Hooks circular base 15–22(–25) × 5–8 µm high, regularly distributed between long cells, in pairs or threes with silica, cork or additional hook cells, frequently solitary, density 8–11 hooks/100 µm 2; Macro-hairs 280–420(–510) µm long, circular base 14–24(–28) µm, regularly distributed in rows from mid-dorsal area to base of lemma.

Lemma apical surface: Characterised by similar long cells to those of the dorsal area, slightly shorter 15–27 × 8–12 µm. Short cells: Silica and Cork cells of equal size, morphology and distribution, silica more frequent than cork cells in dorsal area. Spines and hairs: Hooks equal to those at dorsal area, but irregularly distributed; Prickles circular base 20–40 µm and 50–150 µm long, distributed at middle and distal parts of apex and up to 6 prickles/ 100 µm 2; Macro-hairs circular base 16–25(–27) µm and up to 550 µm long, located at distal part of apex.

Material studied: Morocco: Aroval, -277590/3295248, 1670 m.s.a.l., 24-V-2017, M . Chambouleyron ( ECWP s.n. (HSSrf 241(1/2))); Sefrou. Annoceur, 1610 m.a.s.l., 19-VI-2020, M . Chamboleyron , ECWP n.n.

Figures

FIGURE 60. Lemma surface of Stipa bufensis. (1) and Stipa juncea (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.