18(13). Cells of anther equal in size and position; seed coat close, not obviously 

 reticulate (19) 



18. Cells of anther unequally placed, the upper one attached by its middle; seed 



coat loose, evidently reticulate (20) 



19(18). Capsule symmetrical, both cells dehiscing equally; anther cells mucron- 

 ate-tipped; stem leaves sessile and clasping 18. ParentucelUa 



19. Capsule asymmetrical, usually decurved, opening on the distal side; anther 



cells not mucronate-tipped; stem leaves prominently petiolate 



19. Pedicularis 



20(18). Upper corolla lip (galea) much longer than the small 3-toothed or 3- 

 keeled lower lip; calyx tubular; plants perennial or rarely annual.... 

 20. Castilleja 



20. Upper corolla lip not (or not greatly) surpassing the inflated saccate lower 



lip; calyx tubular-campanulate; plants annual 21. Orthocarpus 



1. Bacopa Aubl. Water-hyssop 



Low succulent perennial herbs; flowers axillary; calyx 5-parted, the uppermost 

 divisions broadest, the innermost often very narrow; upper lip of corolla entire 

 to notched or 2-cleft and the lower lip 3-lobed or the limb almost equally 5-Iobed; 

 style dilated or bilobed at apex; seeds numerous. 



Aboui 100 species, primarily in warm regions. 



1. Leaves cuneate to narrow bases. 1 -nerved; pedicels much-exceeding the sub- 

 tending leaves, conspicuously 2-branched below the calyx 



1. B. Monnieri. 



1. Leaves rounded to broad or more or less clasping bases, 3- or more-nerved; 



pedicels mostly shorter than the subtending leaves (2) 



2(1). Leaves ovate, pellucid-punctate; flower usually closely subtended by a pair 

 of minute bractlets; ovary surrounded by a slenderly 10- to 12- 

 toothed disk; upper lip of corolla obcordate 2. B. caroliniana. 



2. Leaves suborbicular to broadly obovate, not obviously punctate; flowers not 



subtended by bractlets; disk at base of ovary none or without 



slender teeth; upper lip of corolla merely emarginate 



3. B. rotiindifolia. 



1. Bacopa Monnieri (L.) Wettst. Fig. 682. 



Plant with prostrate to decumbent or loosely ascending stems, forming mats, 

 fleshy, glabrous; leaves spatulate to cuneate-obovate, obtuse to rounded at apex, 

 entire or nearly so, to about 2 cm. long; flowers single in nodes, with 2 linear 

 bracts at base of calyx; pedicels to 25 mm. long, soon exceeding the subtending 

 leaves; larger sepals lanceolate to ovate, to 5 mm. wide; corolla campanulate, only 

 obscurely bilabiate, white to lilac or pale-blue, 8-10 mm. long, glabrous within; 

 capsule slenderly conic to ovoid, 5-7 mm. long, shorter than the calyx. Incl. var. 

 cuneifoUa Fern., Bramia Monnieri (L.) Penn. 



In mud and sand in depressions among dunes, about ponds, along streams and 

 ditches, in wet mud on edge of water, forming mats in water, in e., cen. and s. 

 Tex., Apr.-Sept.; from Fla. to Tex., n. to Va. 



2. Bacopa caroliniana (Walt.) Robins. Blue hyssop. Fig. 682. 



Stems from creeping rhizome, floating or ascending, to about 4 dm. high, 

 lanate at summit; plant (when bruised) lemon-scented; leaves in subapproximate 

 pairs, ovate to ovate-elliptic, obtuse, clasping, to 25 mm. long, entire, pellucid- 

 punctate, fragrant, the nerves pedately radiating from base; flowers single, scarcely 

 exserted beyond leaves, with short pedicels; calyx often with 2 minute subulate 

 basal bracts, the outer sepals cordate; corolla blue, about 1 cm. long, pubescent 



1458 



