108 cxxxiii. ORCHiDEiE (rolfe). [PeHstylus. 



38. 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 Herminitim, 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 . . . 1. P. quartinianus. 



Spur curved, a little shorter than the lip . . . 2. P. vol kens iantis. 



Spur oblong, less than half as long as the lip. 



Front lobe of lip linear-oblong (Abyssinian species) . 3. F. petitianvs. 

 Front lobe of lip broadly triangular (Cameroon species) 4. P. Preussii. 

 Spur saccate or subglobose, very short. 



Spur obtuse 5. p. Ufehureanus. 



Spur obscurely bilobed 6. P. Steudneri. ' 



1. P. quartinianus, A. Rich, in Ann. Sd. Nat. ser. 2, xiv. 265^ 

 t. lQ,Jig. 2. Plant IJ ft. high, 2-3-leaved, with a short sheath near 

 the base. Leaves oblong or lanceolate-oblong, apiculate or acute, 2-3 

 in. long, ^-1 in. broad. Spikes 4-5 in. long, lax. Bracts lanceolate, 

 acuminate, ^-1 in. long. Pedicels 2J-3 lin. long. Sepals ovate, sub- 

 acute, carinate near the apex, If lin. long; margin ciliolate. Petals 

 broadly ovate, obtuse, carinate, scarcely ciliolate. Lip Ij-lf 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, J lin. long. Column 

 very broad, scarcely J lin. long; caudicles short! Eostellum oblong, 

 tooth-like, minute.— A. Rich. Tent. Fl. Abyss, ii. 287, t. 85 ; Reichb. f. 

 in Walp. Ann. iii. 582. Platanthera qvxirtiniana, Engl. Hochgeb. FL 

 Trop. Afr. 178. EahenaHa roemeHana, Durand & Schinz, Conspect. 

 Fl. Afr. V. 85. 



ITile Ziand. Abyssinia: Tigre; around Adowa, Quartin- Billon (ex Bichard); 

 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, l^ 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. Sepals 

 ovate, acute. Petals as long as the sepals, oblong, obtuse. Lip tri- 

 lobed ; side lobes diverging, linear from a broader base, obtuse; front 

 lolte linear, acute; disc with a median elevated keel; spur curved, a 



