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The useful trees of northern Nigeria

APPENDIX I. NOTE ON THE TABLE OF FLOWERING SEASONS.

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The following list of Flowering Seasons has been compiled from 3 years’ observations between 9° and 14° North Latitudes. No account has been taken of out-of-season flowering, which is of casual occurrence and due to various causes. The lengths of the flowering seasons are due chiefly to the wide distribution of the trees and do not necessarily represent the lengths of time individuals will bear flowers. Few species, in fact, bear flowers for longer than one month; many for only a few days, but a journey from north to south will show the effects of varying humidity on the flowering season. Such an influence may be counteracted by the date on which a fire swept through the country, fires exerting a quickening influence on the flowering to a marked degree.

The arrangement of the monthly columns so as to place the New Year in the middle of the page is made for the purpose of grouping the flowering period of those species which start flowering before January, whose periods would otherwise be broken up. Comparatively so few trees flower after June that the breaking of their periods is of little account.

This list will illustrate, also, the effect of fires at various times of the dry season on the different species, which may be more exactly determined by making an allowance for the situation of a forest in terms of degrees latitude. In this connection attention may be drawn to the large number of species whose fruits or seeds persist on the branches until the rainy season of the following year, and which will be destroyed by such fires. Only those species whose fruit forms and falls in the rains of the year in which it flowered will stand a fair chance of germinating.

Any observed extension, before or after the periods given here can be entered by extending the lines to correspond and suit the particular case.

TABLE OF FLOWERING SEASONS.

No. Name of Tree. Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun

1 Acacia albida

2 Acacia arabica

3 Acacia campylacantha

4 Acacia Dalzielii

5 Acacia nilotica

6 Acacia Senegal

7 Acacia Seyal

8 Acacia Sieberiana

9 Adansonia digitata

10 Adina microcephala

11 Afrormosia laxiflora

12 Afzelia africana

13 Albizzia Brownei

14 Albizzia Chevalieri

15 Amblygonocarpus Schweinfurthii

16 Andira inermis

17 Anogeissus leiocarpus

18 Anona senegalensis

19 Balanites aegyptiaca

20 Balsamodendron africanum

21 Bauhinia reticulata

22 Bauhinia rufescens

23 Berlinia auriculata

24 Bombax buonopozense

25 Borassus flabellifer

26 Boswellia Dalzielii

27 Bridelia ferruginea

28 Bridelia scleroneura

29 Burkea africana

30 Butyrospermum Parkii

31 Cassia Arereh

32 Cassia goratensis

33 Cassia Sieberiana

34 Celtis integrifolia

35 Combretum abbreviatum

36 Combretum hypopilinum

37 Combretum lecananthum

38 Combretum leonense

39 Combretum micranthum

40 Combretum verticillatum

41 Cordia abyssinica

42 Crataeva Adansonii

43 Crossopteryx Kotschyana

44 Croton amabilis

45 Cussonia nigerica

46 Detarium senegalense

47 Dichrostachys nutans

48 Diospyros mespiliformis

49 Ekebergia senegalensis

50 Entada sudanica

51 Eriodendron orientale

52 Erythrina senegalensis

53 Eugenia guineensis

54 Ficus capensis

55 Ficus gnaphalocarpa

56 Ficus iteophylla

57 Ficus Kawuri

58 Ficus platyphylla

59 Ficus polita

60 Ficus Thonningii

61 Ficus Vallis-Choudae

62 Gardenia erubescens

63 Gardenia ternifolia

64 Grewia mollis

65 Guiera senegalensis

66 Gymnosporia senegalensis

67 Hannoa undulata

68 Hymenocardia acida

69 Hyphaene Thebaica

70 Isoberlinia Dalzielii

71 Isoberlinia doka

72 Khaya senegalensis

73 Kigelia aethiopica var. bornuensis

74 Lonchocarpus griffonianus

75 Lonchocarpus laxiflorus

76 Lophira alata

77 Maerua angolensis

78 Maerua crassifolia

79 Mimosa asperata

80 Mitragyne africana

81 Monotes Kerstingii

82 Moringa pterygosperma

83 Ochna Hillii

84 Odina acida

85 Odina Barteri

86 Ormocarpum bibracteatum

87 Ostryoderris Chevalieri

88 Paradaniellia Oliveri

89 Parinarium curatellaefolium

90 Parinarium macrophyllum

91 Parkia filicoidea

92 Parkinsonia aculeata

93 Prosopis oblonga

94 Pseudocedrela Kotschyi

95 Psorospermum senegalense

96 Pterocarpus erinaceus

97 Randia nilotica

98 Raphia vinifera

99 Rhus insignis

100 Sarcocephalus Russegeri

101 Sclerocarya Birroea

102 Securidaca longipedunculata

103 Sterculia tomentosa

104 Stereospermum Kunthianum

105 Strychnos spinosa

106 Strychnos triclisioides

107 Swartzia madagascariensis

108 Tamarindus indica

109 Terminalia avicennioides

110 Terminalia glaucescens

111 Terminalia macroptera

112 Trichilia emetica

113 Uapaca guineensis

114 Vernonia amygdalina

115 Vitex Cienkowskii

116 Vitex diversifolia

117 Ximenia americana

118 Zizyphus Jujuba

119 Zizyphus mucronata

120 Zizyphus Spina-Christi

12 9 7 18 24 39 51 78 85 67 40 26

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