184 ORCHIDS OF THE CAPE PENINSULA. 
KEY TO THE SPECIES. 
(Flowers expanded, yellow.) 
Limb of the lip rhomboidal, or linear, small. 
Appendage of the lip saddle-shaped ; flowers small .. P. praryprratum 1. 
rs rf fiddle-shaped, apex serrate P. cATHOLICUM 2. 
“ , 3 aa ONT’ sie .. P. ACUTIFOLIUM 3. 
+ a cruciform .. ar Bc .. P. cruciFERuUM 4. 
Limb of the lip rhomboidal, broad ; appendage cup-shaped PP. Vouucris 7. 
Limb of the lip oblong, bilobed, wider than long. 
Appendage of lip short, broad, columnar ; flowers large P. carrrum 5. 
ss », long, narrow, lobed; flowers small .. P. anatum 6. 
(Flowers contracted, purple.) 
Appendage of lip bent forward, short and beaked .. P. carnnosum 8. 
§ 1. Hupterygodium. 
1. Pterygodium platypetalum, Lindley, in Gen. & Sp. Orch. 
(1888), p. 866.—T wo to six inches high; stem slender, usually flexuous, 
distantly 1-2-leaved ; lower leaf linear-lanceolate, acuminate, 1-14 in. 
long, upper smaller; flowers 1-2, distant, about 6 lines long and 
9 lines wide; bracts ovate, acuminate, nearly as long as the flower; 
odd sepal lanceolate, acuminate, very concave, or almost saccate 
towards the base ; side sepals concave, spreading horizontally ; petals 
nearly semiorbicular, bilobed on the upper margin, rounded below, 
very concave; limb of the lip small, somewhat rhomboidal, acute, 
curved, the appendage produced above into two large ear-like lobes, 
thence bent back at a right angle and saddle-shaped, with distinct 
hanging flaps and anarrowed point; arms of the rostellum horizontal ; 
stigmas 2, subdistant; ovary obovate, trigonous, curved, with 3 
prominent ribs. ‘‘ P. catholicum var. minor,” sheet a. in Thunberg’s 
herbarium. Arethusa alaris, Thunberg, Prodr. Plant. Cap., p. 3. 
Has. Near the saddle between the eastern and western peaks of the Devil’s 
Peak, Pillans ; on the mountain north of the Hout’s Bay Neck, 1800 ft., fl. Sept., 
Dr. R. Marloth (No. 4945 in herb. Bolus); somewhat rare. — Extends to Du Toit’s 
Kloof, Wellington, and Caledon. Zeyher, 3944; Drege, 8280. 
The flowers are a pale sulphur-yellow. The peculiarly-shaped lip 
and its small size and delicate habit at once distinguish this interesting 
little species from any other. It seems to be scarce on the Peninsula, 
for during ten years of frequent botanical excursions I never found it. 
2. Pterygodium catholicum, Swartz, in Kongl. Vetensk. Acad. 
Handl., vol. xxi. (1800), p. 217.—Six inches to a foot high; stem 
rather slender; leaves 2, distant, the lower radical, oblong, obtuse, 
and apiculate, or acute, sheathing at base, usually waved or crisped, 
subglaucous, 2-4 in. long; the upper cauline, much smaller ; raceme 
loosely 2-6-flowered, hood of the flower about 7 lines wide and long, 
