84 
Arenaria patula Michaux, sandwort [M: Minuartia patula 
(Michaux) Mattf.] (Maguire, 1951; Wofford, 1981) 
(note that the question of whether Minuartia should be 
Segregated from Arenaria remains controversial; see 
McNeill (1962, 1980) for an opposing viewpoint), 
644 
p. 
var. patula [S: incl. f. pitcheri (Nutt.) Steyerm.] (Maguire, 1951) 
var. robusta (Steyerm.) Maguire [S: incl. f. media Steyerm.] 
(Maguire, 1951) (note that S: attributed f. media to 
var. patula, rather than var. robusta; this complex 
requires further stu 
+A. serpyllifolia L., thyme-leaved sandwort, p. 642 
SSp. serpyllifolia 
ssp. leptoclados (Reichb.) Nyman [S: A. serpyllifolia var. tenuior 
Mert. & Koch; G: 4. serpyllifolia] (Akeroyd, 1988) 
A. stricta Michaux, rock sandwort [M: Minuartia stricta (Michaux) 
Hiern.] (Maguire, 1951: Wofford, 1981) (see note 
under A. patula; also note that if this taxon is 
transferred to Minuartia, the correct combination is M. 
michauxii (Fenzl) Farw.), p. 643 
SSP. stricta 
ssp. texana (Robinson) Maguire [S: A. stricta] (Maguire, 1951) 
the infraspecific taxonomy of this species requires 
further Study) 
CERASTIUM, chickweed 
Cerastium arvense L., mouse-ear chickweed, prairie chickweed [S: 
var. villosum (Muhlenb. ex Darl.) Hollick & Britton f. 
oblongifolium (Torrey) Pennell] (most North American 
authors have not recoon; d infraspecific taxa in this 
species; Ugborogho (1977), however, recognized 7 such 
taxa based upon cytological and morphological 
characters; although Missouri plants would fall 
nomenclaturally into his SSp. velutinum (Raf.) Ugbor. 
var. vil (Miihlenb. ex Darl.) Ugbor., the plants 
themselves are more variable morphologically than can 
be accommodated in his key), p. 648 
S: Steyermark ;: Great Plains Flora M: Mohlenbrock 
