266 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
ibus concavis obtusis glabris 3 mm. longis; petalis late ovatis 
apice rotundatis 5 mm. longis 4 mm. latis; filamentis glabris obcom- 
pressis 4 mm. longis; antheris circa 2 mm. longis; ovario abortivo 
minuto fere vel omnino glabro; ramulis inflorescentiae 9 3-8 em. 
longis; floribus breviter pedicellatis ; sepalis petalisque ovatis 
subacutis vel acutis; capsulis glabris argute triquetris pallide brun- 
neis 8-10 mm. longis 4-5 mm. crassis ; stigmatibus brevibus sessili- 
bus.— Mexico: on calcareous hills near Tehuacan, alt. 1725 m., 
C. G. Pringle, no, 8578 (type in hb. Gr.). 
A stout species to be readily recognized by its crowded greenish 
yellow subsessile staminate flowers with broad free petals rounded 
at the apex. 
Cerastium Barberi, spec. nov. Laete viride perenne a basi 
ramosum 1.8—2.8 dm. altum, caulibus 1 vel pluribus erectis vel basi 
decumbentibus inferne foliosis superne subnudis praeter lineam 
angustam lateralem puberulam glaberrimis ; foliis oblongo-lanceola- 
tis acutiusculis crassiusculis sessilibus 1.2—2 cm. longis 5 mm, latis 1- 
nervatis utrinque laete viridibus margine prope basim retrorse cilia- 
tis; pedicellis 1-2 em. longis unilateraliter retrorse puberulis apice 
nutantibus; bracteis ovatis ciliatis aliter glabris ; sepalis ovato- 
oblongis tenuibus 6-7 mm. longis laete viridibus ciliolatis obtusis 
margine plus minusve scariosis ; petalis albis 6 mm. longis vix per 
quarternam partem longitudinis bipartitis, parte indivisa obovata 2- 
2.5 mm. lata; staminibus 10; filamentis basi ad apicem gradatim 
attenuatis ; stylis 3 valde exsertis; capsula ovoideo-cylindrica 8-10 
mm. longa exserta, seminibus circa 20.— Mexico: in the Sierra 
Madres near Colonia Garcia, Chihuahua, 27 June, 1899, C. H. 7. 
Townsend and C. M. Barber, no. 453 (type in hb. Gr.). 
Related to C. nutans, Raf., but readily distinguished by its very 
different pubescence. 
arnassia Townsendii, spec. nov. Glaberrima, radice fibroso, 
caule solitario 3.5 dm. alto an 
mediam unifoliato; foliis 
5-T7- 
gam gradatim attenu- 
Bae eos: folio unico caulini ovato 
. longis 3.5 mm. latis pallide viridi- 
3 petalis 1.5 em. longis 8 mm. latis pallide luteis ovatis circa 
