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low the throat and included, separateand stipitate anther-cells, 2-lobed 
stigma, valves of pod soon 2-parted, and placente left in the axis. 
1. S. durantifolia Swartz. Annual with indurated base, viscid-pubescent: leaves 
either opposite or 3 to 4-nate, from oblong to linear-lanceolate, serrate or denticulate, 
narrowed below and with somewhat dilated partly clasping base: inflorescence spici- 
form, leafy below: calyx 2-bracteolate: corolla purplish, 6 mm. long.—Wet grounds, 
southern borders of Texas. 
2. S. lanata Ruiz & Pavon. White-woolly, with prostrate stems: leaves oblong, 
dentate, sessile or cordate-amplexicaul.—Brazos Santiago (Nealley). A Mexican spe- 
cies that has extended northward along the Gulf coast. 
9. CONOBEA Aublet. 
Low branching herbs, with opposite leaves, small solitary flowers on 
axillary peduncles, 5-parted equal calyx, upper lip of corolla 2-lobed 
and lower 3-parted, 4 fertile stamens with approximate anthers, and 
2-lobed stigma with the lobes cuneate. 
1. C. multifida Benth. Annual, diffusely spreading, much branched, minutely 
pubescent: leaves petioled, pinnately parted, divisions linear-wedge-shaped: pedun- 
cles naked: corolla greenish-white, scarcely longer than the calyx.—Extending from 
the Atlantic region to southern and western Texas. 
10. HERPESTIS Gertn. f. 
Low herbs, with opposite leaves, solitary axillary flowers, 5-parted 
calyx (upper division broadest, innermost often very narrow), upper 
lip of corolla entire, notched or 2-cleft and lower 3-lobed (or limb nearly 
equally 5-lobed), 4 stamens all fertile, and style dilated or 2-lobed at 
apex. 
* Corolla plainly bilabiate, the 2 upper lobes united to form the upper lip: leaves many- 
nerved, 
1. H. nigrescens Benth. Erect or ascending, very leafy, glabrous: leaves pin- 
nately veined, oblong to cuneate-lanceolate (2.5 to 5 cm. long), serrate: pedicels equal- 
ing and the upper surpassing the leaves: corolla whitish or purplish.—Wet places, 
along and near the coast, extending from the coast of Maryland. 
2. H. chamedryoides HBK. Lower and generally ditfuse and decumbent: leaves 
pinnately veined, ovate or oblong (12 to 18 mm. long), serrate, mostly surpassed by 
the pedicels: corolla yellow.—Moist ground, throughout southern Texas, where also 
occurs var. PEDUNCULARIS Gray, with erect and simpler stems, smaller and narrower 
leaves, and filiform pedicels of thrice their length. 
3. H. rotundifolia Pursh. Nearly smooth, creeping: leaves round-obovate, half- 
clasping, 12 to 25 mm. long, entire, basally nerved: peduncles twice or thrice the 
length of the calyx: corolla white or pale blue.—Margins of ponds, extending from 
the Mississippi Valley to southern Texas. 
** Corolla obscurely bilabiate, the limb subequally 5-lobed: stamens almost equal. 
4, H. Monniera HBK. Glabrous, prostrate, and creeping: leaves spatulate to 
obovate-cuneate, entire or somewhat toothed, nearly nerveless, sessile: corolla pale 
blue,—Common in southern Texas. 
11. GRATIOLA L, (HEDGE Hyssop.) 
Low herbs, with opposite sessile leaves, axillary 1-flowered peduncles 
(usually with 2 bractlets at base of calyx), 5-parted calyx with narrow 
