RHINANTHACEAE. 165 



3. PENTSTEMON [Mitchell] L. Herbs. Leaf -blades entire, toothed, 

 or dissected. Flowers borne in racemose or paniculate cymes. Calyx-lobes 

 5, longer than the tube. Corolla 2-lipped, the lips more or less spreading. 

 Capsule valvate. 



1. P. multiflorus Chapm. Stem 4-14 dm. tall: blades of the upper leaves 

 narrowly oblong to oblong-lanceolate, 3-9 cm. long, entire or undulate-toothed: 

 calyx-lobes ovate, 3-4 mm. long: corolla white or purple-tinged, 15-20 mm. 

 long: capsules 8-10 mm. long. Pinelands. BEARD-TONGUE. 



4. RUSSELIA Jacq. Shrubs commonly with rush-like stems. Leaves 

 mostly scale-like or sometimes with small blades. Cymes diffuse. Sepals 

 broad, nearly distinct. Corolla tubular or tubular-f unnelf orm : lobes very 

 short. Capsule globular to ovoid. 



1. B. equisetifonnis Schlecht. & Cham. Stems tufted, spreading or arching, 

 the branches striate: leaves various, those on twigs with spatulate or obovate 

 blades 1-1.5 cm. long, those on the stem and branches reduced to short scales: 

 flowers numerous: calyx 3-4 mm. long; lobes ovate: corolla bright-red, 20-26 

 mm. long; lobes ovate. [R. juncea Zucc.] Pinelands. Nat. of Mex., and 

 cultivated. (Ber., Bah., Ant.) FOUNTAIN-PLANT. CORAL-FLOWER. 



5. BKAMIA Lam. Succulent, odorless, creeping herbs. Leaf-blades 

 broadest above the middle, entire or nearly so, sessile. Flowers axillary. 

 Calyx with the upper lobe broadest. Corolla nearly regular. Style elongate. 



1. B. Monniera (L.) Drake. Stem and branches glabrous, 1-6 dm. long: 

 leaf- blades 1-2 cm. long, sometimes inconspicuously toothed: outer calyx- 

 lobes becoming 5-6 mm. long, usually acute: corolla white or pale-blue; upper 

 lobes retuse: capsules 5-8 mm. long. Coastal hammocks. F. K. (Ber., Bah., 

 Cuba, Ant.) 



6. HYDROTBIDA Willd. Aromatic, succulent, creeping or floating herbs, 

 the stems terete. Leaf-blades narrowest above the middle, partly clasping. 

 Flowers axillary. Calyx with the outer lobes cordate. Corolla 2-lipped. 

 Style elongate. 



Upper leaf-blades oblong or ovate-oblong, entire or undulate. l. H. caroliniana. 

 I'pper leaf-blades orbicular or ovate-orbicular, shallowly toothed. 2. H. crenulata. 



1. H. caroliniana (Walt.) Small. Stem and branches 2-6 dm. long: leaf -blades 

 oblong or ovate-oblong, 1-2 cm. long: outer calyx-lobes becoming 6-7 mm. 

 long: corolla blue; tube 6-7 mm. long: capsule about 4 mm. long. Everglades. 



2. H. crenulata Small. Similar to H. caroliniana in habit, but larger: leaf- 

 blades orbicular to ovate-orbicular, 1.5-2.5 cm. long: outer calyx-lobes becom- 

 ing 10-11 mm. long: corolla blue; tube 7-8 mm. long: capsules about 5 mm. 

 long. Everglades. 



7. MECARDONIA R. & P. Erect or diffuse, wiry herbs, the stems 

 angled. Leaf-blades toothed, narrowed at the base. Flowers axillary. Calyx- 

 lobes 5, unequal. Corolla mainly white or pink, 2-lipped. Stamens 4. Style 

 short. 



Leaf-blades mostly spatulate : upper sepal linear or oblong at maturity : corolla 



8-10 mm. long. 1. M. acuminata. 



Leaf-blades mostly ovate or oval : upper sepal ovate or oval at 



maturity : corolla 5-7 mm. long. 2. M. procumbent. 



1. M. acuminata (Walt.) Small. Stem and branches 1-6 dm. tall: leaf-blades 

 spatulate to oblong or elliptic, 2-5 cm. long, bluntly serrate: calyx-lobes becom- 



