144 AMERICAN MIDLAND NATURALIST 
lata, plerumque mortua vel languescentia, caulina media vel 
oblonga vel lanceolata, basi lata et apicem versus sensim angustata, 
internodis multo breviora, summa mensura reducta, forma autem 
aequalia. Flores in axillis foliorum aut solitarii aut in ramis 
brevibus 2-4, pauci quidem in plantis subsimplicibus, sed in plantis 
luxuriosis propter ramos earum fastigiatos nimios valde numerosi. 
Pedicelli 0.5—2 cm. longi. Lebi calycis 4 sive 5, longitudine ad- 
modum inaequales vel ferme aequales, quorum 2 latiores et 2 
vel 3 angustiores et tubo corollae aut acquales aut multo breviores 
sunt. Corolla 10-12 mm. longa, 4-5-lobata, extremitates versus 
attenuata, colore candide sulfureo, lobis semper clausis, acutis, 
2.5x2 mm. diametris, basi fimbriarum setacearum nulla corona 
vestitis, nisi forte setae binae unum vel plures lobos adornant. 
Annual. Stem nearly simple or moderately to profusely 
branched from the base, terete or angular or even lightly winged 
as well as the branches, straw-colored, strict, 1-4.5 dm. high, 
with internodes in larger plants about 4.5 cm. long. Basal leaves 
oval or spatulate, mostly faded or fading. Middle stem leaves 
oblong or lanceolate with a broad base and narrowing gradually 
towards the apex, very much shorter than the internodes, the 
uppermost reduced in size, but equal in outline. Flowers in the 
axils of the leaves, either solitary or 2-4 on short branches, being 
few in subsimple plants, but very numerous in well developed plants 
on account of their superabundance of fastigiate branches. Pedicels 
0.5-2 cm. long. Calyx lobes 4 to 5, very unequal or nearly equal 
in length, 2 of them broader and 2 or 3 narrower, either equalling 
the corolla tube or very much shorter. Corolla 10-12 mm. long, 
4—5-merous, tapering toward the ends, of a bright sulphur-yellow 
color, its lobes acute, 2.5x2 mm. in diameter, always closed, with 
no crown of setaceous fimbriae at its base, only exceptionally 
with a pair of setae to one or more lobes. 
Related to this species are A. scopuloruwm Greene and A. 
plebeva (Cham.) Greene which are 1-3 dm. high, with internodes 
in larger plants 2.5—7.5 cm. long, shorter sepals, blue flowers and 
deeply fringed appendages; and A. strictiflora (Rydb.) Greene with 
leaves equalling or surpassing the internodes, with a dense and 
spike-like inflorescence, and with numerous, crowded, almost 
sessile flowers. 
This is a plant inhabiting damp prairie ground. The type 
was collected by the writer on August 2nd, 1902, three miles 
