36 Engelmann and Gray, 
ceolato-oblongis vel ovato-lanceolatis utrinque acutis grosse 
serratis (serraturis plerumque patentibus mucronulatis eglan- 
dulosis) supra puberulis subtus cum petiolis brevibus eglandu- 
losis tomentoso-pubescentibus ; stipulis setaceis glanduliferis 
petiolum sequantibus; umbellulis 2-3-floris; pedicellis calyci- 
busque (laciniis ovatis obtusiusculis) pubescentibus ; petalis 
orbiculatis ; ovario glabro. — P. Chicasa 8? normalis, Torr. & 
Gr. Fl. I. p. 467. Open post-oak woods west of the Brazos, 
where it is called Post-Oak Plum. A low shrub, with leaves 
only one to two inches long. Doubiless a distinct species, 
which should stand between P. Chicasa and P. glandulosa. 
238. CENOTHERA SERRULATA, 0. spInuLosA, Torr. & Gr. An 
unusually large-flowered form ; the petals an inch in length. 
Sandy, dry, or moist prairies. May — June. 
239. Gaura Lonerrtora (Spach): elata, pilis brevibus 
undique canescenti-puberula; caule erecto paniculato-ramo- 
sissimo ; foliis lanceolatis lineari-lanceolatisve utrinque angusta- 
tis mucronato-acuminatis, sparsim repando-denticulatis, rameis 
multo minoribus linearibus integerrimis; spicis ramosis laxi- 
floris; bracteis linearibus deciduis; calycis segmentis tubum 
plerumque superantibus ; petalis spathulatis longe unguiculatis 
calyce et staminibus brevioribus ; nuce sessili ovata canescente 
4-carinata nervis 4 intermediis leviter notata. —G. exaltata, 
Engel. MSS. G. biennis, @. Pitcheri, Torr. & Gr. Fl. I. 
p. 517. — Prairies at the margin of woods between the Brazos 
and the Colorado, &c., where it often exclusively covers large 
spaces of ground; flowering in August and September. Plant 
taller and much more branching than G. biennis (6-9 feet 
high) with narrower leaves, smaller flowers (the petals turn- 
ing from white to reddish,) and much smaller and, when ripe, 
rounder fruit. The G. filipes, ¢. major, Torr. & Gr. Ll. c., 1s 
confused with this species. Spach described from an imper- 
fect specimen collected in Louisiana, by Drummond. The 
specific name has no particular applicability. 
240. G. Drummonni, Torr. & Gr. l.c. Dry banks and 
road sides. Canescently pubescent; the leaves often sinuate- 
