198 CXXXIII. ORCHIDE (ROLFE). [Peristylus. 
33. PERISTYLUS, Blume; Lindl. Gen. & Sp. Orch. 297. 
Sepals and petals free, subequal, connivent or subconnivent. 
Lip continuous with the column, free or slightly adnate to it, produced 
at the base into a short, sometimes very short, spur ; limb erect or 
somewhat spreading, entire or trilobed. Column short, footless; 
clinandrium erect, short. Anther cells parallel; apex inferior, short 
and adnate to the base of the column; pollinia granular, with short 
caudicles and exserted naked glands; staminodes lateral, auriculate. 
Stigma sessile ; rostellum subulate or tooth-like, situated between the 
anther cells. Capsule ellipsoid or oblong. 
A genus of about 40 or 50 species, dispersed through the north temperate regions, 
and in the tropics of Asia and Africa, chiefly in the mountains. 
Very nearly allied to Herminium, and chiefly distinguished by the presence of a 
distinct spur instead of a gibbous or nearly obsolete sac. 
Spur cylindrical, much longer than the lip . S . 1. P. quartinianus, 
Spur curved, a little shorter than the lip è < . 2, D volkensianus. 
Spur oblong, less than half as long as the lip. 
Front lobe of lip linear-oblong (Abyssinian species) . 3. P. petitianus. 
Front lobe of lip broadly triangular (Cameroon species) 4. P. Preussii. 
Spur saccate or subglobose, very short. 
Spur obtuse . : z ; S ` è . 5. P. lefebureanus. 
Spur obscurely bilobe . ` : . S . 6. P. Steudneri. 
1. P. quartinianus, A. Rich. in Ann. Sci. Nat. sér. 2, xiv. 265, 
t. 16, fig. 2. Plant 1} ft. high, 2-3-leaved, with a short sheath near 
the base. Leaves oblong or lanceolate-oblong, apiculate or acute, 2-3 
in. long, 4-1 in. broad. Spikes 4-5 in. long, lax. Bracts lanceolate, 
acuminate, 4—1 in. long. Pedicels 24-8 lin. long. Sepals ovate, sub- 
acute, carinate near the apex, 13 lin. long; margin ciliolate. Petals 
broadly ovate, obtuse, carinate, scarcely ciliolate. Lip 14-1} in. long, 
trilobed from a short claw; lobes linear, obtuse ; front lobe a little 
longer than the side lobes, incurved ; spur cylindrical, subacute, 5 lin. 
long. Stigmatic lobes oblong, fleshy, apiculate, 4 lin. long. Column 
very broad, scarcely 4 lin. long; caudicles short. Rostellum oblong, 
tooth-like, minute.—A. Rich. Tent. Fl. Abyss. ii. 287, t. 85; Reichb. f. 
in Walp. Ann. iii. 582. Platanthera quartiniana, Engl. Hochgeb. FL 
Trop. Afr. 178. Habenaria ræmeriana, Durand & Schinz, Conspect. 
Fl. Afr. v. 85. 
Wile Land. Abyssinia: Tigre; around Adowa, Quartin-Dillon (ex Richard); 
without precise locality, Schimper, 1265 ! 
2. P. volkensianus, Rolfe. Plant very slender, 2-3 ft. long, leafy 
in the middle, with several sheaths below. Leaves 5—6, oblong, acute, 
4 in. long, 14 in. broad; base attenuate. Spikes 10 in. long, rather 
dense-flowered, or more lax at the base. Flowers greenish-yellow, very 
small. Bracts lanceolate, acuminate, as long as the flowers. Sepai 
ovate, acute. Petals as long as the sepals, oblong, obtuse. Lip tri- 
lobed ; side lobes diverging, linear from a broader base, obtuse ; front 
lobe linear, acute; dise with a median elevated keel; spur curved, 3 
