110 
ment as long as the others, pubescent on 
its posterior face. Anther-sacs distinct, 
glabrous or barbate with short hairs. 
Sepals lanceolate to ovate, acute to acumi- 
nate. Seedswingless. Inflorescence com- 
pound, a raceme of cymosely branching lax 
flower-clusters. Stem-leaves clasping. 2. Penstemon. 
Corolla semi-fleshy, white or rose, densely 
confluent, deiiaias lanose. Sepals ovate- 
orbicular, rounded. Seeds winged. In- 
florescence simple, a spike-like raceme of 
single flowers on short several-bracted 
pedicels. Stem-leaves narrowed at base, 
short-petioled. 3. Chelone. 
Corolla red-brown, glabrous within, its antero- 
lateral lobes vertically projecting, the anterior 
lobe deflexed. Sterile filament shorter than 
wide, two-lobed, yellow or red-brow In- 
florescence compound. 4. Scrophularia. 
' BB. Filaments four or two, the posterior one being lost. 
C. Acaulescent. Corolla racer slightly zygo- 
morphic, white or lavender-tinged. Capsule two- 
celled at base, septicidal. Stigmacapitate. Small 
herb, spreading by stolons. 
_ 
II. LIMOSELLEAE. 
5. Limosella. 
CC. Caulescent, with leaves mainly cauline. Corolla 
zygomorphic, the lobes shorter than the tube. 
Capsule two-celled throughout. Inflorescence 
simpiy racemose. 
D. Leaves opposite. Corolla without a spur. 
by a simple split down median line of 
carpel. IV. GRATIOLEAE- 
Corolla yellow or white, with throat four- 
angled, its orifice open; pubescent within 
at base of posterior lobes. Postero-lateral 
stamens perfect, antero-lateral reduced to 
sterile filaments or wanting. Several 
bractlets at base of the five distinct sepals. 
Capsule septicidal, or tardily slightly 
ulicidal. 6. Gratiola. 
Hoan yellow or lavender-blue, with throat 
somewhat flattened into a horizontal 
plane, channeled beneath and arched 
