78 



GENTIANACE^E. 



Hoods with horn-like process within 2 



Hoods cleft at the back (outside), hornless 8 



Hoods cleft on the inside, hornless 4 



1. PHTLBERTIA, HBK. 



1. P. linearis, var. heterophylla, Gr. Corolla 6 lines broad, dull-colored. S. CaL 



2. ASCLEPIAS, Linnaeus. 



Corolla-lobes 4 or 5 lines long: hoods 5 or 6 lines long, back prolonged . 1 



Corolla-lobes whitish, 3 lines long: hoods truncate; horns little exserted 2 



Corolla-lobes greenish, 3 or 4 lines long: hoods appendaged on sides 3 



Corolla-lobes whitish, ovate, 3 lines long 4 



Corolla-lobes greenish or purplish, 3 lines long: horns triangular, obtuse 5 



Corolla-lobes greenish or purplish, 2 lines long: horns slender, exserted 



1. A. speciosa, Torr. Stout, 2 to 5 ft. high: follicles with soft spines. 



2. A. Fremonti, Torr. A foot high or less: short- woolly: leaves obtuse. 



3. A. erosa, Torr. Leaves ovate or narrower, acuminate, margins scarious. 



4. A. eriocarpa, Benth. Densely woolly: leaves often in S's, 4 to 8 inches long. 



6. A. vestita, H. & A. Dense white wool deciduous in age: leaves very acute, long. 

 6. A. Mezicana, Cav. Smooth; slender leaves in whorls, 3 to 6 inches long. 



3. SCHIZNOTUS, Gray. 



1. S. ptirpurasceno, Gr. Decumbent or prostrate: leaves cordate: corolla reddish. 



4. GOMPHOCAKPUS, Robt. Brown. 



1. G. cordifolius, Benth. Smooth: loosely flowered: corolla dark purple-red. 



2. G. tomentosus, Gr. Woolly: stem angled: corolla greenish or purplish. 



GENTIANACEJE. 



Corolla from funnelform to salverform: leaves opposite. 



Corolla yellow, 4-lobed: anthers not twisted , 1 



Corolla red, 3-5-lobed: anthers spirally twisted in age 9 



Corolla blue or white: stigma flat, nearly sessile 3 



Corolla rotate, 4-parted with fringed glands: leaves opposite or whorled 4 



Corolla campanulate: leaves alternate or radical, 3-f oliolate or renif onn 



1. MICROCALA, Link. 



1. M. quadrangularis, Griseb. Slender, 2 or 3 inches high: calyx 4-anglad. 



