TETRANDRIA M0N0GYNIA. Houstonia, 
107 
H. longifolia. Willd. sp. pi. 1 . p. 583 ? 
Along the sea-coast, in sandy fields : Carolina to Flori- 
da If . May — -July. v. v. Flowers purple. 
0. H. caule erecto superne ramoso ad geniculis pubescente, 
foliis sessilibus ovatis lanceolatis vel lineari-lanceolatis, 
fasciculis terminalibus corymbosis. Willd. sp. pi. I. 
p. 584. 
H. varians. Mich.jl. amer. 1 . p. 8(5. 
Hedyotis umbellata. Walt.jl. car. 85. 
Knoxia purpurea. Lam. illustr. 1 . p. 2 5Q. 
In dry woods : Pensylvania to Carolina. Ij.. June, July. 
v . v. Flowers purple. 
135. AMM ANNIA. Gen. pl. 20 6. 
X. A. caule erecto, foliis lanceolato-linearibus basi dilatata 
semi-amplexicaulibus, floribus inferioribus verticillatis. 
— Willd . sp. pl. 1. p. 6JQ. 
In swamps and inundated fields : Virginia, Carolina, and 
the western territories. ©.July, Aug. v. v. Flow- 
ers purple. 
2. A. caule procumbente, foliis lanceolatis in petiolum an- 
gustatis, floribus solitariis oppositis sessilibus. — Midi, 
fi. amer. l. p. gg. 
A. ramosior. Walt. fi. car. 88. 
In gravelly wet places, along rivers : Virginia to Caro- 
lina. 0. Aug. Sept. v. v. Flowers red. 
136. PTELEA. Gen. pl. 1505. 
1. P. foliis ternatis. Willd. sp, pl. 1 . p. 6j 0. 
Icon. Schmidt arh. 2. t. 76. Mill, ic.2, t. 211. 
ft, P. foliis quinatis. Du Roi. 
/3. P. foliis pubescentibus. ^ 
In shady moist hedges and on the edges of woods among 
rocks : New York to Carolina. ^ . June. v. v. A 
small tree or shrub from ten to fifteen feet high. 
Flowers small, greenish white, in corymbous clusters. 
The variety /3 grows in Pensylvania, and appears to be 
anew species. 
137- CORNUS. Gen.pl.\g4. 
* Involucratce capitalce. 
l.C. herbacea j foliis summis verticillatis venosis, involu- 
cris ovatis acuminatis, drupis globosis. Willd. sp. 
pl. 1 .p. 66l. 
purpurea • 
ramosior . 
humilis . 
trifoliata. 
pentaphylla. 
pubescens. 
canadensis 
