Species within a genus

angustus, = narrow, strait, close, contracted, small, not spacious;
folium, = a leaf.
(narrow-leaved)
(Alien and naturalised)
(ld, BL, CW)

arva, = an arable field, cornfield;
arvus, arvum, = that has been ploughed, but not yet sown, ploughed, arable; an arable field, cultivated land, a field, ploughed land, glebe;
-ensis, = indicates country or place of growth or origin or else habitat.
(growing in fields or cultivated land)
(pertaining to fields or cultivated lands; presumably relating to its weediness)
(Alien)
(ld, BL, Cw)

For William John Burchell (1781-1863);**
-anus, = belonging to, connected with, pertaining to, used to form adjectives from nouns, particularly from geographical and personal names.
(Alien and naturalised)
(Ch, BL)

campester, campestris, = of or pertaining to a level field, even, flat, level, champaign.
(pertaining to lands or flat areas as opposed to hills and mountains)
(Alien and naturalised)
(ld, BL)

dubius, = wavering in opinion, doubting, doubtful, dubious, uncertain.
(doubtful)
(Alien and naturalised)
(ld, BL, Cw)

glomero, = to gather into a round heap or knot, to collect, press, crowd, assemble together;
(form into a ball)
-atus, = indicates possession or likeness.
(compactly clustered)
(Alien)
(ld, BL, Cw)

repo, repens, = to creep, crawl; creeping, crawling.
(creeping prostrate and rooting)
(Alien)
(ld, BL)

sub, = under, below, beneath, underneath; a little, somewhat, rather, slightly;
(below, under, approaching, almost, somewhat, not completely, a little)
terra, terrenum, = land, ground, soil.
(ld, BL)