244 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-pubescenlibus ; stipulis setaceis glanduliferis 

 petiolum a?quantibus ; umbellulis 2-3-floris; pedicellis calyci- 

 busque (laciniis ovatis obtusiusculis) pubescentibus ; petalis 

 orbicularis ; ovario glabro. — P. Chicasa &? normalis, Ton*, fy 

 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. Doubtless a distinct species, 

 which should stand between P. Chicasa and P. glandulosa. 



238. OENOTHERA SERRULATA, 8. SPINULOSA, ToTT. fy" Gr. All 



unusually large-flowered form ; the petals an inch in length. 

 Sandy, dry, or moist prairies. May — June. 



239. Gaura longifeora (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, ff. Pitcheri, Torr. fy 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. fy Gr. I. c, is 

 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. Drummondii, Torr. fy Gr. I. c. Dry banks and 

 road sides. Canescently pubescent ; the leaves often sinuate- 



