1953] 



REVISION OF BRACHYOTUM 



359 



35. Calyx lobes lanceolate, longer than wide; petals rhombic-obovate, acute, with gland- 

 tipped cilia 1.6. quinquenerve. 



35. Calyx lobes broadly triangular and often apiculate, wider than long; petals broadly ob- 

 tuse, the cilia non-glandular or the glands early caducous. ... 20. B. sanguinolentum. 



36. Connective at anther base prolonged ventrally and free of anther at least 0.3 mm. . 38. 



36. Connective at anther base not at all prolonged ventrally 37. 



37. Leaf blades 20-60 X 10-25 mm.; lateral flowers of dichasium with pedicellar (although 

 early-caducous) bracteoles 16. B. gracilescens, 



37. Leaf blades 10-15 x 5-8 mm.; all flowers with ebracteolate pedicels 



17. B. fraternum. 



38. Dichasia corymbiform; calyx lobes wider than long, broadly triangular 



20. B. sanguinolentum, 



38. Dichasia solitary; calyx lobes longer than wide 39« 



39* Dichasial peduncle erect; bracteoles inserted below middle of pedicel; petals broadly 



acute to obtuse 21. B. grisebachii. 



39. Dichasial peduncle drooping; bracteoles inserted above middle of pedicel; petals 

 broadly obtuse to rounded 28. B. alpinum. 



40. Flowers predominantly 5-merous 45. 



40. Flowers predominantly 4-merous 41. 



41. Leaf blades with 3 primary veins (cf. 40. B. rosmarini folium) 43. 



41. Leaf blades with 5 or more primary veins 42. 



42. Dichasia solitary in leaf axils; petals obtuse, with eglandular cilia; connective barely 

 prolonged ventrally, free of anther only 0.1-0.2 mm 18. B. rugosum. 



42. Dichasia paniculate; petals acute, with gland-tipped cilia; connective definitely pro- 

 longed ventrally, free of anther 0.3-0.6 mm 1. B. quinquenerve, 



43« Connective prolonged ventrally, free of anther 0.5-0.7 mm.; petals deep purple 



1 1. B. maximowiczii. 



43. Connective not at all prolonged ventrally; petals greenish-white or edged with red. 44. 



44. Trichomes markedly plumulose, non-glandular except for petal cilia; petioles 8-10 mm. 

 long; calyx lobes triangular, about as wide as long 1 5. B. weberbaueri. 



44. Trichomes minutely roughened, at least those of hypanthium, lower leaf surface, and 

 ovary gland-tipped; petioles 2-5 mm. long; calyx lobes oblong-ovate, longer than wide. 

 43* B. lutescens. 



45. Upper leaf surface densely beset with tubercles in 4 rows at widest part of blade; an- 

 ther pore Y 2 or more as wide as anther base 39. B. lycopodioides, 



45. Upper leaf surface variously pubescent but if tuberculate, the tubercles in 6 or more 

 rows; anther pore less than Y 2 as wide as anther base 46. 



46. Connective prolonged ventrally and free of anther 0.3 mm. or more; petals deep purple, 

 except B. figueroae 51. 



46. Connective barely or not at all prolonged ventrally, free of anther less than 0.2 mm.; 

 petals yellowish to whitish, at least marginally, except (?) occasionally in B. ros- 

 tratum 47. 



47. Hypanthium glandular-hirsute, or sparsely to moderately strigulose and then glandular 

 or not; ovary pubescence and petal cilia gland-tipped; apical lobes of ovary 0.1-0.4 

 mm 49. 



47. Hypanthium very densely strigulose to hirsute, the trichomes never gland-tipped; ovary 

 pubescence and petal cilia non-glandular; apical lobes of ovary 0.5-2 mm 48. 



48. Trichomes shaggy-plumulose, those on lower leaf surface very dense (30-60/mm. 2 ) and 

 graded in size with the numerous smaller ones almost stellate; leaf blades mostly 15- 

 25x7-12 mm.; ovary sparsely strigulose on apical % to V 3 14. B. ledifolium. 



48. Trichomes minutely roughened, those on lower leaf surface only 5-15/mm. 2 and not 

 markedly graded in size, never pseudo-stellate; leaf blades mostly 30-75 X 10-35 mm.; 

 ovary densely strigulose on apical ]/ 2 13. B. gleasonii. 



49. Bracts at base of dichasium persistent at least until anthesis 42. B. rostratum. 



49. Bracts at base of dichasium very early caducous 50. 



50. Leaf blades elliptic, 12-21 X 4-8 mm., the tubercles on the upper surface in more than 

 10 irregular rows at widest part; hypanthium glandular-hirsute 45. B. seorsum. 



50. Leaf blades narrowly oblong, 7-17 X 1.5-3.5 mm., the tubercles on the upper surface in 

 only 6 rows at widest part; hypanthium moderately strigulose, the trichomes non-gland- 

 ular 44. B. angusti folium. 



51. Calyx lobes triangular-acuminate to almost triangular, usually wider than long, the si- 

 nuses obtuse to very broadly acute 19« B. microdon. 



51. Calyx lobes ovate to oblong, longer than wide, the sinuses narrowly acute 52. 



