ROTTBOELLIA 
547 
5. Kerrieae (stips. distinct; axis not forming part of fruit; sta. 
tapering upwards from broad base; cpls. few, whorled; 
sta. 00): Rhodotypos, Kerria. 
6. Potentilleae (as 5, but cpls. usually 00 , in a head, or rarely 
few and then sta. also few) : 
6 a. Rubinae (drupes, no epicalyx) : Rubus. 
6 b. Potentillinae (achenes ; seed pendulous ; usually epicalyx) : 
Fragaria, Potentilla. 
6 c. Dryadinae (as b, but seed erect) : Geum, Dryas. 
7. Cercocarpeae (stipules slightly developed; torus tubular; cpl. 
1 ; achene) : Adenostoma, Purshia. 
8. Ulmarieae (torus flat or nearly so; sta. with narrow base) : 
Ulmaria. 
9. Sanguisorbeae (torus cup-like enclosing cpls., hardening in 
fruit; cpls. 2 or more): Alchemilla, Agrimonia, Poterium. 
10. Roseae (torus cup-like or tubular, enclosing go cpls., and 
fleshy in fruit) : Rosa. 
IV. NEURADOIDEAE (cpls. 5 — 10 syncarpous and united to 
torus, which is dry in fruit; herbs). 
11. Neuradeae : Neurada. 
V. PRUNOIDEAE (cpl. 1, rarely 2 — 5, free of torus; drupe; 
trees with simple leaves ; style almost terminal ; ovules pendu- 
lous ; firs, regular). 
12. Pruneae : Nuttallia, Prunus. 
VI. CHRYSOBALANOIDEAE (as V, but style basal and ovules 
erect) : 
13 a. Chrysobalaninae (nearly regular) : Chrysobalanus. 
13 b. Hirtellinae (zygomorphic) : Hirtella. 
[Placed in Rosales by Benth. -Hooker, in Rosiflorae by Warming, 
who splits up the order considerably.] 
Rosales. The 14th cohort (Engler) of Archichlamydeae (p. 128). 
The nth cohort (Benth. -Hooker) of Polypetalae (p. 133). 
Rosiflorae (Warming). The 19th cohort of Choripetalae (p. 137). 
Roscoea Sm. Zingiberaceae. 4 sp. I-Iimal. R. purpurea Sm. is often 
cultivated. It has a zygomorphic fir. with two lips. Insects landing 
on the lower and probing for honey find their way obstructed by two 
projecting spikes from the lower end of the anther; pressure on these 
brings the anther (with the stigma, which projects beyond it) down 
upon the insect’s back. The flr. is protandrous. [Cf. Salvia.] 
Rosmarinus (Tourn.) Linn. Labiatae (1. 2). 1 sp. Medit., R. offici- 
nalis L., the rosemary, a xerophytic shrub with leaves rolled back 
and stomata in hairy grooves on lower side (cf. Ericaceae, Empetrum). 
Oil of rosemary is employed in perfumery &c. 
Rotala Linn. Lythraceae. 32 sp. trop. and subtrop., in wet places. 
Rottboellia Linn. f. (excl. Ophiurus Gaertn. f.). Gramineae (11). 30 
sp. trop. 
35—2 
