j 
Truss ITI. 
out or wholly within the others). 
XCVIII. ACANTHACEA: (BURKILL AND CLARKE). 
Ruellieze.— Corolla-lobes contorted in the bud (no lobe wholly with- 
Stamens 4 polliniferous (except in Brillantaisia, 
Lankesteria) ; anther-cells at equal height ; pollen of 3 forms, viz. (a) globose, honey - 
] combed or reticulated ; (b) 
(9-15) narrow longitudinal smooth grooves. 
many extremely fine hairs which spring out on applying water. 
Subtribe i. Hycrornine%.—Ovules 3 or more in each 
cell ; capsule (unless accidentally) many-seeded. Corolla 
distinctly 2-lipped (see also Mel/era among the Euruel- 
lice). 
| Retinacula very small, conical, not curved ; seeds without 
on hygroscopic hairs. —Small herbs . . 
Retinacula curved ; seeds with hygroscopic hairs ; anther- 
cells muticous ; pollen ellipsoid, ribbed longitudin- 
ally. 
Stamens 4 . . . . . 
Stamens 2. Flowers large or medium 
Subtribe ii. Eurvueiire«.—Ovules 3 or morein eack cell ; 
capsule many-seeded. Corolla not (or indistinctly) 2- 
lipped (in J/elleru, the anticous lobe of corolla is ovate, 
by twice as broad as the others). 
Pollen globose; surface honeycombed or reticulated. 
oO, 
(Stamens 4; anthers muticous; inflorescence not 
strobilate.) 
8 Leaves in subequal pairs, subequal at the base 8. RUE. 
Leaves in unequal pairs, oblique at the base . 9. EnposirHoy. 
Pollen ellipsoid, with 9-15 narrow longitudinal smooth 
grooves. 
Flowers large, laxly or closely panicled. Large plants. 
Corolla 2-lipped, anticous lobe twice as broad as the 
others. . . : . 10. Meuiera. 
Corolla not 2-lipped. 
{ Anther-cells 8, muticous . . 11. PavLowiLHeEbMi.. 
Anther-cells 6, muticous, 2 long-spurred 12. Mrmunorsis. 
Anther-cells 4 ; calyx cylindric, ribbed 13. Puysacantnts. 
Flowers in axillary clusters ; corolla scarcely } in. long 14. Hemicraruis. 
| Flowers solitary ; corolla 1-1} in. long; leaves linear . 15. Rue.uiopsis. 
iy Pollen globose, echinate. Three posticous calyx-lobes 
iy connate more than half their length (except in D. 
™ thunbergiiflorus) . . . . 16. Disricnocatyx. 
-btribe iii. SrropiiantHes.—Ovules 2 or 1 in each 
cel]. Corolla not or obscurely 2-lipped. 
of the capsule so as to throw out the seeds. 
Pollen globose, echinate or nearly smooth. 
Valves of the placenta not rising elastically from the base 
Pollen strongly echinate . . . . 17. 
Pollen minutely echinate, nearly smooth. Sepals 
large subcorolloid. Seeds without elastic hairs 18. 
Pollen globose, honeycombed or reticulate. 
Stamens 4. Calyx cylindric, 5-ribbed. . 19. 
Stamens 2 . . . ° . . . . 20. 
Pollen ellipsoid, with 9-15 narrow longitudinal 
smooth bands. 
Capsule cylindric, 4-seeded . . . . 21. 
Capsule ellipsoid, flattened, 2-seeded . 22. 
globose, echinulate or nearly smooth; (c) ellipsoid, with 
Calyx or bracteoles often conspicuous. 
_ Seeds (in all but two or three small genera) discoid, covered, at least on margins, with: 
. SYNNEMA. 
. HyGRornins. 
. BRILLANTAISIA. 
ACANTHOPALE, 
WHITFIELDIA, 
SATANOCRATER. 
LANKESTERIA, 
DyscHoristeE, 
DiIsPeRMA, 
