388 OIX. ACANTHACEX. (C. B. Clarke.) 
Tribel. Thunbergiese. Scandentortwining. Calyx minute, annular 
or 10-15-toothed. Corolla-lobes twisted in bud. Ovules 2 in each cell, 
collateral. Capsule beaked; retinacula 0 . . . 1. THUNBERGIA. 
Tribe 2. Nelsoniese. Corolla-lobes imbricate in bud. Ovules many, 
superimposed in two rows in each cell. Seeds small, seated on minute 
papillz, not on hard retinacula, obscurely albuminous. 
Calyx 4-partite. Stamens 2. Bracts rigid, imbricate. 2. ELYTRARIA. 
Calyx 4-partite. Stamens 2. Bracts herbaceous . . 3. NELSONIA. 
Calyx 5-partite. Stamens4 . . . . . . . . . #=4 EBERMAIERA. 
Calyx 5-partite. Stamens 2,exserted . . . . . . 5. OPHIORRHIZIPHYLLUM. 
Tribe 3. Euellieze. Corolla-lobes twisted to the left in bud. Seedson 
retinacula. Sepals 5, or 4 with one larger. -Anthers usually 2-celled ; cells 
parallel or one a little below the other. Style 2-fid, one lobe often 
suppressed. 
Subtribe 1. PoLYSPERMEÆ. Ovules 3-12 in each cell. Capsule normally 
6- or more-seeded. 
* Corolla distinctly 2-lipped. 
Lower leaves often toothed or pinnatifid. Flowers 
axillary, sessile. Retinacula scarcely hooked . . . 6. CARDANTHERA. 
Leaves entire. Flowers axillary, subsessile. Retinacula 
hooked . . . . . . . ew . . . . . . . Z7. HYGROPHILA. 
Cymes elongate. Branches sympodal . . . . . . 8. NOMAPHILA. 
** Corolla subequally 5-lobed. 
Bracteoles large. Stamens muticous, Capsule clavate. 
Base of capsule solid . . -. 5. . . 10. RUELLIA. 
Cymes elongate with sympodal branches. Anther-cells 
mucronate at base . . . - . 1l. ECHINACANTHUS. 
Flower-clusters separate on the cyme-branches. ' Con- 
nective excurrent at tip. Capsule seed-bearing 
from the base . . . - + . . 17. AECHMANTHERA. 
Flowers capitate or axillary, subsessile. Bracteoles 
small, narrow, or 0. Capsule seed-bearing from the 
Vos. e e ee sos s s ee s s . . 16. HEMIGRAPHIS. 
Flowers clustered at the nodes of the almost leafless 
branches in terminal panicles. Stamens muticous. 
Capsule seed-bearing from the base . . . . . . 16. STENOSIPHONIUM. 
ine 2. TETRASPERMER. Ovules 2 in each cell. Capsule 4- or fewer- 
seede 
* Placente not rising elastically from the base of the capsule (except in 
a few Strobilanthes). 
Corolla subequally 5-lobed. Stamens 4 or 2; anthers 
muticous . . . 18. STROBILANTHES. 
Corolla large, deeply 2-lipped. ‘Stamens 4; anthers 
muticous . soe 5.505. . 19. CALACANTHUS. 
Corolla somewhat "2. -lipped, ` Stamens 4; anthers 
minutely mucronate at base . . 9, CALOPHANES. 
rolla-tube very long, linear; lobes subequal. Stamens 2 14. DEDALACANTHUS. 
** Placente rising elastically from the base of the ripe capsule. 
Corolla small. Stamens 4. BracteolesO . . . . . 18. PHAYLOPSIS. 
Stamens 4  Bracteoles very large, reticulately nerved . 12. PETALIDIUM. 
