Engelmann, George Feb. 6, [1845] [4] (seq. 138)

5)
leaflets. The five alternate anthers are shorter.
233. Algarobia glandulosa T & Gr. Sparsely or forming thickets in low prairies
on the Colorado.
fr. end of August. — This shrub or small tree, 10 feet high, stem 6 to 8 inches thick,
called
in Texas "Muskit-tree" is first found as a small low shrub in the San Bernardo
prairie
west of San Felipe, and becomes larger and more frequent westwardly. It character-
izes a new vegetation; in the muskit-thickets on the Colorado a small
Echinocactus
(E. setispinus) is common; and on their boarders is found the
singular Opuntia
putescens (No. 244); and on naked places in the neighborhood, especially on
deserted
anthills a large Echinocactus (E. gyracanthus) often a foot in diameter,
strikes
the traveler with the impression of a tropical vegetation. F. Lindheimer.

The leaflets in our specimens of A. glandulosa are partly linear, 1 line wide,
often
oblong, 1 1/2 to 2 lines wide but also elliptical, obluse, half as wide as long; some-
times all these forms on the same specimen. This plant is very remarkable on
account of the drupaceous structure of the fruit; the inner chartaceous or nearly
bony
part of the pericarp (or legume) separates from the pulpy parenchyma and encloses
each seed separately, forming as many nuclei as there are seeds. This structure
appears to occur amongst the Leguminosae only once more, in Detarium Juss
from Africa, which however is oneseeded, and where the pericarp is said to be
entirely fleshy.
234. Schrankia angustata Torr & Gr. Sandy prairies between the Brazos &
Colorado, May to Aug.
235. Darlingtonia brachyloba DC. var. glandulosa T & Gr Wet prairies west of the Brazos,
fr. in July. — We have also seen the slender variety var. illinoensis from the seacoast
of Texas.
236. Prunus glandulosa Hook Low shrubs on sandy hills in the Prairies west
of the Brazos.
fl. in Febr. — "Fruit yellowish red as large as a middlesized cherry." Lindh.
Therefore probably a Prunus. But on one of our specimens in a half grown
fruit
entirely juiceless and still covered with tomentum of the ovary.
237. Prunus gracilis n.sp. Ramis subinermibus; foliis oblongo-lanceolatis,
infra
supraque acutis, grosse et irregularites serratis (serratun's plerumque patentibus)
supra glabriusculis, sublus cum petiolis brevibus eglandulosis tonetoso pubescenitbus
stipulis setaceis, glandulosis, petiolos aequantibus; umbellulis 2-3 floris;
pedicellis calycibusque pubescentibus ; calycis laciniis ovatis, obtusiusculis,
petalis orbiculatis, ovario glabro.

In open post oak woods (Quercus obtusiloba) west of the Brazos in small groups,
fl. in March. — It is Prunus chicasa, var. normalis of Torr & Gr. but I take it to
be a distinct species, characterized by the small (about 1 1/4 inch long), very
pubescent
leaves, with mostly spreading serratures; the very short (1 to 1 1/2 lines long) and not
glandular petioles; the small flowers and pubescent (and not glandularly serrate
acutish)
lobes of the calyx. We find no notice of the fruit in Mr Lindheimer's labels, where it is
called "Post oak-plum". On our specimens are a few fruits of the size of the
fruit
of Cerasus serotina, perhaps not full grown, though of a blackish colour. — The
species
appears intermediate between Prunus chicasa and P. glandulosa; it is
as low a
shrub as this one, with nearly as small leaves, but is is a plant with much
slender branches and with elegantly shaped leaves. —

238 Oenothera serrulata Nutt Oe. spinulosa Torr & Gr. nearly smooth
with large flowers,
petals often 1 inch and even more in length; stems many from the same root
mostly simple or branching at base. — Sandy dry or moist prairies west
of the Brazos, May & June.
239. Gaura exaltata n.sp. caule erecto elato, paniculato-ramosissimo,
adpresse
pubescente, foliis lanceolatis s. linear--lanceolatis, supra infraque angustitatis,