A new species of Sartidia (Graminae), endemic to ultramafic soils

Phylogenetic relationships of Aristida and relatives (Poaceae, Aristidoideae) based on noncoding chloroplast (trnL‐F, rpl16) and nuclear (ITS) DNA sequences

“…In all these genera, the lemma is three‐awned, but sometimes the lateral awns are reduced or suppressed in Aristida and Stipagrostis . Sartidia differs from Stipagrostis in having stiff, rigid, spirally contorted, and glabrous awns (de Winter 1965; Balkwill et al, 2011), whereas Stipagrostis has at least one fine plumose awn (de Winter 1963, 1965) (Fig. 1C).…”

“…Aristida longifolia has an inner sheath (IS) with thicker cell walls than the outer sheath (OS), the OS has few or no chloroplasts and the chlorenchyma has isodiametric cells. Sartidia species have an inner sclerenchyma sheath and an outer parenchyma bundle sheath with few or no chloroplasts, and the mesophyll chlorenchyma is nonradiate with isodiametric cells (de Winter, 1965; Balkwill et al, 2011; Fig. 2C).…”

“…Aristida is the largest and most widespread genus with 250 to 290 species (Clayton and Renvoize, 1986; Watson and Dallwitz, 1992). The second largest genus is Stipagrostis with 50 species, and the smallest is Sartidia with 5 species (de Winter, 1965; Bourreil, 1967; Balkwill et al, 2011).…”

Plant census and floristic analysis of selected serpentine outcrops of the Barberton Greenstone Belt, Mpumalanga, South Africa

“…Twenty-eight of these taxa have been found to only occur on soils derived from serpentinite rocks. The other four taxa have also been found on ultramafics of the Onverwacht group, which show very similar patterns of soil chemistry and toxicity as the serpentine outcrops (Balkwill et al, 2011). Three of these endemic taxa, Helichrysum sp.…”

PACMAD Clade

“…dewinteri occurs on serpentine soils in South Africa (Balkwill et al 2011). Annuals or perennials, caespitose, rhizomatous or stoloniferous, sometimes becoming somewhat Launert 1971) woody at the base.…”