270 Mr. Bentuaw’s Review of the Order of Hydrophyllez. 
in the Labiate, Echium in Borraginee, or Eutoca and Phacelia in Hydro- 
phyllee, being present or absent in two species otherwise very closely allied. 
In Hydrophyllee, their form is very variable. In general their centre is entirely 
blended with the corolla, and their broad dilated margins, embracing the basis 
of the filaments, are alone visible; but in the genus Hydrophyllum they appear - 
to be constantly linear, adnate along the back, but free at the upper extremity 
and the margins. In Emmenanthe and some Eutoce, as also in Echium vul- 
gare and several Cynoglossa, they are reduced to ten very small orbicular 
squamze, placed quite at the base of the corolla; and in Eutoca grandiflora 
and parviflora, Phacelia fimbriata, and some others, they disappear entirely, 
a transverse nerve connecting the base of the stamina alone indicating their 
usual position. 
The stamina in all Hydrophyllew are much alike, of equal size, and regularly 
divergent; their only differences are in the unimportant character of length and 
in the hairiness of the filaments. "The anthers are always oblong or linear, 
with parallel cells. 
The style, in several species, shows readily to the naked eye the real struc- 
ture of those Labiate, Borraginec, &c., which are said to have a simple style, 
with two subulate stigmata. The style is, on the contrary, in fact bifid, each 
lobe bearing at the extremity a small stigma. The ovarium of Emmenanthe 
is covered with a glandular pubescence; that of all other Hydrophyllee is 
clothed with white erect rigid hairs. The style of Phacelia and Eutoca is 
usually more deeply cleft than in the other genera, but the latter character 
is very uncertain. 
The placentation of the ovarium is of great importance in the generic dis- 
tribution of Hydrophyllee. In Hydrophyllum, Nemophila, and Ellisia the two 
placentze are broad, fleshy, line the whole ovarium, adhere at the top and basis 
only, being free from the parietes, and bear on their inner surface each of them 
from two to sixteen ovulz placed in two vertical rows, one on each side of the 
central line. In Eutoca, Phacelia, and Emmenanthe the placentz are linear or 
slightly dilated, and adhere more or less to the parietes along their central line, 
bearing on their inner surface from two to fifty or sixty ovulæ, arranged either 
in two rows, or covering the whole surface without any apparent arrangement. 
As the fruit ripens, the broad placenta of the three first-named genera con- 
