AFRICAN

ORCHIDS

Disperis natascha-oppeltiae Eb.Fisch., Killmann, Delep. & J.-P.Lebel, Orchidee (Hamburg) 63: 277 (2012).
Description:
Terrestrial orchid up to 13 cm tall, with subterranean ovate tubers. Leaves 2, opposite, cuneate to truncate at base, acuminate at apex, unequal, one leaf larger, up to 5 cm long and 1.5-1.8 cm wide, the other 2 cm long and 1 cm wide. Inflorescence erect, with 3-4 flowers, bracts with undulate margin, cordate at base, acuminate at apex, 0.65 x 0.29 cm. Flowers white, up to 1.5 cm long, spur greenish, joined sepals and petals with green stripes inside. Dorsal sepal joined with petals, forming a horizontal spur, slightly emarginate at apex, spur 0.4-0.5 cm long and 0.2-0.3 cm in diameter. Lateral sepals ovate, 0.49 x 0.32 cm, joined for about 0.25-0.3 cm, with short, sac-like spur up to 0.065 cm long. Petals 0.27 x 0.19 cm. Lip claw linear, ribbon-like and twisted, up to 0.04 cm wide and 0.4 cm long, extending into spur and ending 0.16 cm before end of spur, apex bent over, up to 0.1-0.17 cm long, irregularly lobed, yellow, with numerous fimbriae up to 0.05-0.06 cm long. Column up to 0.25 cm long. Ovary usually curved at apex in an angle of 90°, thus arranged almost parallel to the horizontal spur, 0.9-1 cm long.
Etymology:
This species is dedicated to Prof Natascha OPPELT by Mr John David ASQUITH, who has taken a patronage for this newly discovered orchid within the organisation BIOPAT.
Habitat:
Understorey of rainforest in leaf-litter, 1835 m
Phenology:
Flowering from december.
Cultivation:
As given for the genus.
Notes:
Disperis natascha-oppeltae belongs to the Disperis anthoceros-group within subgenus Dryorkis (KURZWEIL & MANNING 2005). It differs from Disperis reklieberae in the shorter and broader spur, the shorter lip claw, and the shape of the lip appendage with longer fimbriae.
Distribution:
In Nyungwe National Park in Cyamudongo Forest
References:
Disperis natascha-oppeltae, a new species from Nyungwe National Park, Rwanda, Die Orchidee 63(4), 2012
Images:
Click on each image to see a larger version.

Habitat/In situ Habitat/In situ Habitat/In situ
Disperis natascha oppeltiae 01 Disperis natascha oppeltiae 02 Disperis natascha oppeltiae  05
Photograph© João
Farminhão/ Missouri
Botanical Garden.
Image used with
kind permission.
Photograph© João
Farminhão/ Missouri
Botanical Garden.
Image used with
kind permission.
Photograph© João
Farminhão/ Missouri
Botanical Garden.
Image used with
kind permission.




























Disperis uzungwae Verdc., Kew Bull. 41: 56 (1986).
Description:
Plants 100-150 mm. Leaves 2, alternate, elliptic-ovate, 25-45 × 14-30 mm. Flowers several, white; median sepal with curved spur 5 mm long, lateral sepals basally united, elliptic, 3.5-4 × 22.5 mm; petals oblong, ± 3.3 × 1.7 mm; lip hidden in spur, blade lorate, ciliate, appendage linear-oblong, apically erose or bifid.
Habitat:
The type material was collected in a forest clearing on the site of an old fireplace at 750m.
Phenology:
Flowering in April.
Cultivation:
As given for the genus.
Distribution:
Tanzania
References:
A synopsis of the genus Disperis Sw. (Orchidaceae), ADANSONIA, sér. 3 - 2005 - 27 (2) : 155-207; A Key to the East African Species of Disperis (Orchidaceae) with Two New Species, Kew Bulletin Vol. 41, No. 1 (1986),
Images:
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Disperis katangensis var. katangensis
Description:
Terrestrial herb 5-20 cm tall, tuber c. 1 cm long, globose; leaves 2, alternate, 1-3 x 0.8-2 cm, ovate, cordate at base, deep dull green with whitish veins on upper surface, deep purple below; inflorescence 1-5 flowered, ovary 10-13 mm long, bracts leaf like, 6-20 mm; flowers pale mauve with yellow and purple marks inside hood; dorsal sepal 7-17 mm long, linear, adnate to petals to form an open hood 13-15 mm long, 5.5-11 mm deep and 15-18 mm wide across mouth; lateral sepals 12-15 x 6-11 mm, obliquely elliptic, apiculate, joined for quarter to one third their length, each with a sac-like spur up to 0.5 mm long; petals 7-17 x 7-11 mm, elliptic; lip 7.5-10 mm long, claw sharply bent back near base dilating into a densely papillate appendage, broadly reniform.
Habitat:
Brachystegia woodland 1500–1800 m.
Flowering time:
Dec - Frb
Distribution:
Zambia; Angola; Tanzania; Zaire;
References:
Flora Zambesiaca volume:11 part:1 (1995) Orchidaceae by I. la Croix and P.J. Cribb
Images:
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Habitat/In situ  Habitat/In situ  Habitat/In situ  Habitat/In situ  Habitat/In situ 
Disperis katangensis var. katangensis  01  Disperis katangensis var. katangensis 02 Disperis katangensis var. katangensis 03  Disperis katangensis var. katangensis 04  Disperis katangensis var. katangensis 05 
Photograph© Nicholas Case
Wightman Image used with kind
permission. 
Photograph© Nicholas Case
Wightman Image used with kind
permission.
 
Photograph© Nicholas
Case Wightman Image
used with kind
permission.
   
Photograph© Nicholas Case
Wightman Image used with kind
permission.
 
Photograph© Nicholas Case
Wightman Image used with kind
permission.
 





















Disperis capensis var. brevicaudata Rolfe in W.H.Harvey & auct. suc. (eds.), Fl. Cap. 5(3): 303 (1913).
Description:
Differs from the typical variety in the smaller habit, the boat-shaped median sepal and the absence of the lip appendage. The sepal caudae are only 2.5-3 mm long.
Habitat:
Found in the same area as the typical variety and often together with it.
Notes:
The reduction of floral structures may indicate a step in its evolution to autogamy.
Cultivation:
As given for the genus.
Distribution:
SW. & S. Cape Prov.
References:
A synopsis of the genus Disperis Sw. (Orchidaceae), ADANSONIA, sér. 3 - 2005 - 27 (2) : 155-207
Images:
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Disperis guttata Frapp. ex Cordem., Fl. Réunion: 255 (1895).
Description :
Plante de 15-20 cent, de hauteur. Tig. flexueuse, ayant un diamètre d'1-2 millim. Feuill. 2-3, caulinaires, alternes, très espacées, passant brusquement à l'état de braci. vers le haut delà tige, sans changer de forme, mais en réduisant de plus de moitié leur dimension. Ces feuilles, dont la plus longue a 25 millim., avec 1 cent, de largeur à la base, sont deltoïdes, cordées, aiguës, amplexicaules, vert noir en dessus, violacées en dessous, un peu charnues, et laissant peu paraître, par suite de cette dernière circonstance, le réseau de veinules qui les parcourt en tout sens. FI. 1-2 assez petites, rosées, ayant tous les caractères du type générique, avec les particularités suivantes: Sép. latéraux parsemés de grosses taches vertes (d'où le nom spécifique); bras du rosi, largement spatules, et en tout plus grands que chez les autres espèces du même genre, dans l'ile.
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Habitat:
Distribution:
Réunion