AFRICAN

ORCHIDS

Key to sections of genus Angraecum

 

1 Inflorescence one-flowered or at most 2-flowered, he flowers procuded either simultaneously or in succession 2
  Inflorescence several- to many-flowered, racemose or paniculate,rarely through arrested development only with one mature flower 10
2 Plants sessile, with very much reduced stem or stemless; leaves few, all basal Acaulia
  Plants erect with distinct stem; leaves several to many, all cauline 3
3 Ovary sessile, i.e. without a pedicel; peduncle very short, hardly developed 4
  Ovary pedicellate; peduncle more or less distinctly evolve 5
4 Leaves very short, laterally compressed, densely imbricate Dolabrifolia
  Leaves elongate with a distinct blade, or linear, never compressed laterally, more or less laxly distichous
Pectinaria
  Peduncle covered entirely with 3 or 4, laterally compressed sheaths; flowers rather large and conspicuous; ovary often triquetrous Perrierangraecum
  Peduncle covered only at the base with I or 2, adpressed, but not compressed sheaths; flowers as a rule rather small or rarely medium sized; ovary terete 6
6 Peduncle quite short, normally shorter than the internodes, very rarelyas long 7
  Peduncle prominent, slender, normally much longer than the internodes 8
7 Spur of lip as long as the ovary or commonly shorter, very rarely some what surpassing it Conchoglossum
  Spur of lip many times longer than the ovary Filangis
8 Flowers small; spur cylindric or clavate Angraecoides
  Flowers medium sized or larger; spur filiform, elongate 9
9 Lip rather narrow Pseudojumellea
  Lip rather broad (flowers often produced in succession) Arachnangraecum
10 Flowers thin in texture, subdiaphanous 11
  Flowers fleshy in texture 15
11 Stem more or less distinctly produced, occasionally very prominent 12
  Stem not obvious, usually none 14
12 Stem short or rarely somewhat elongate, leafy above; inflorescences borne in the lower leaf axils peduncle setiform, commonly elongate, loosely or more or less loosely few-flowered Gomphocentrum
  Stem prominently elongate, leafy throughout; inflorescences borne from the axils of the upper 13
13 Inflorescence many-flowered, as long as or commonly longer than the leaves; rachis somewhat flexuous Lepervenchea
  Inflorescence few-flowered, commonly, through arrested development,1- to 3-flowered, shorter than the leaves; rachis hardly flexuous Lemurangis
14 Flowers minute, often forming a dense raceme, normally one-sided Nana
  Flowers small to medium-sized, more or less loosely racemose, all roundthe rachis Boryangraecum
15 Stem not obvious, usually none 16
  Stem very prominent 18
16 Spur with a narrow opening; ovary rather long pedicellate Chlorangraecum
  Spur with a wide opening; ovary commonly short pedicellate 17
17 Spur conical or saccate, obtuse and short Hadrangis
  Spur filiform, rather elongated Humblotiangraecum
18 Inflorescence elongate, several-flowered, but usually appearing one at a time (either due to arrested development or their intervallate nature) Afrangraecum
  Inflorescence elongate, always several-flowered Angraecum