310 XXV I II. RUTACE^. [Boron ia 



'Leaves linear or lauceolate, acute, or the lower ones rarely 

 cuneate. 

 Low undershrub. Flowers all axillary. Sepals short . 34. B. 'polygaU folia. 

 "Virgate sliriib. Kowers all axillary. Sepals lanceolate- 

 subulate, elongated 88. ^. c;ras5zj}^5. 



Small branching shrub. Flowers many of them terminal . 46, B, viminea, 

 Ijcaves linear- terete. 



Flowers all axillary. Appendage of the anthers large , . . 39. B, suhsessilis. 

 Flowers many of them terminal. Anthers minutely or not at 



all apiculate 41. B. nmiato^hjUa, 



Series VI. Terminales. — Betals imbricate. Anthers nearly uniform. Leaves^ all 

 simfle {except in B. filifolia, iaoniata, ««^oxyautha). Flowers madly or all terminaly 

 sessile or on shortlflowered jiednncles. 



Terminal flowers sessile, capitate. 



Leaves linear -terete. 



Branches hirsute. Leaves very obtuse 40. B. capitata* 



Glabrous. Leaves mucronate or acute 41. B. nemato])hylla. 



Leaves obovate or spathulate, often creuulate 42. B, crenidaia. 



Leaves rhomboidal, serrulate 43. B. serrulata. 



Terminal flowers solitary, or rarely 2 or 3, sessile or shortly pedi- 

 cellate. 



Leaves obovate-orbicular, coriaceous 44. B. rhomb oidea. 



Leaves linear or lanceolate, rarely oblong-cuneate, flat. 



Small undershrub. Filaments nearly glabrous. Anthers not 



apiculate 45. B. parviflora. 



Slender shrub. Filaments woolly. Anthers apiculate . . 46. B, viminea* 

 Leaves or leaflets linear-terete. 



Leaves simple, or leaflets 3 on a distinct petiole. Pedicels 



slender , , . / 47. B.fiUfoUa* 



Leaflets mostly 3 or 5, small, clustered on a very short 

 common petiole. 



Sepals broad, short. Petals slightly pointed 48. J5. inornata. 



Sepals lanceolate-subulate. Petals mucronate • . . • 49. B. o.ryaniha. 



Series VIL Pedunculatee. — Petals imbricate. Anthers nearly umform. Leaves M 

 simple. Peduncles terminalj sever at *fioicered^ or very rarely \-flowered. 



Leaves (usually numerous) small, sessile or nearly so, with revolute 

 margins. 



Leaves linear or oblong. 



Roughly pubescent or hirsute. Peduncles slightly exceeding 



the last leaves. Sepals subulate-acuminate 50. J5. scahra. 



Glabrous or slightly pubescent. Peduncles much longer than 



the last leaves. Sepals broad, short 51. B. thymifolia. 



Leaves ovate-cordate. Peduncles long 52. B. ovaia. 



Leaves flat, usually thick, glabrous, contracted at the base- 

 Leaves small, obovate or oblong, mostly denticulate. Cymes 



umbel-like- Peduncles short. Pedicels long. Sepals large 53. B.fasiigiata. 

 Leaves elongated, mostly denticulate. Cymes shortly peduncu- 

 late, loose. Sepals small , - , . , 54. -B, denliculata. 



Leaves entire, thick ; lower ones spathulate ; upper ones narrow 

 or linear, distant. Flowerg large, few, or in a loose d^choto- 



mous panicle ...-:.... 55. i?. spathulala. 



Leaves lincar-tcrete. 



Leaves few, thick, and small. Sepals lanceolate-subulate, nearly 



as long as the small petals '. . . 5G. -B. jnncea. 



Leaves numerous. Cymes many-flowered, on long peduncles. 57. B, cymosa. 



Branches slender, divaricate. Leaves slender. Peduncles short 



mostly! -flowered . . ! 47. B.filifolia. 



