i387.) 
PERLSTY'LUS *. 
Linnean Class and Order. Gyna'ndiua f, Mona'ndria. 
Natural Order. Orchi'de.e, Linn. — Juss. Gen. PI. p. 64. — 
Sm. Gram, of Bot. p. 81. ; Engl. Fl.v. iv. p. 3. — Lindl. Syn. p.256; 
Introd. to Nat. Syst. of Bot. p.262. — Rich, by Macgilliv. p. 412. — 
Loud. Hort. Brit. p. 536. — Mack. FI. Hibern. p. 274. — Macr. Man. 
Brit. Bot. p. 224. — Hook. Brit. FI. (4th edit.) p. 425. — Palmares ; 
order, Musales ; sect. Orchidina; ; type, Orchidace.e ; Burn. 
Outl. of Bot. v. i. pp. 391, 437, 458, & 461. 
Gen. Char. Perianthium% ( calyx Sp corolla J (see figs. 1. & 2.) 
superior, permanent. Sepals (fig. 2. a, a, a.) 3, concave, converg- 
ing, ribbed, nearly equal. Petals (fig. 2. b, b.) 2, rather smaller 
than the sepals, egg-shaped, converging. Lip (nectary J (fig. 2. c.) 
lobed, spurred at the base. Spur (fig. 1. c., and fig. 2. cl.) very 
short, usually inflated. Anthers (see fig. 3.) of 2 oblong, mem- 
branous cells, parallel or diverging. Glands of the pollen-masses 
stalked, naked. Germen (see fig. 1. b., & fig. 2./.) oblong, or nearly 
cylindrical, furrowed, spirally twisted. Style ( column J thick and 
short. Stigma a shining moist depression in front of the style. 
Capsule oblong, spiral. Seeds numerous. 
The very short, usually inflated, spur ; the anthers of 2 parallel 
or diverging cells ; and the stalked pollen-masses with 2 naked 
glands; will distinguish this from other genera in the same class 
and order. 
Two species British. 
PERISTY'LUS A'LBIDUS. White Peristylus. White cluster- 
rooted Orchis. Whitish Hand-Orchis. 
Spec. Char. Knobs [of the root] tapering, clustered, undivided. 
Lip in three deep acute lobes ; the middle one largest ; spur one- 
third the length of the germen. 
Peristylus albibus, Lindl. Syn. (2nd cd. ) p. 201. — Platanthera albida, Lindl. 
Syn. (lsted.) p. 261. — Habenaria albida . Brown in Ait. Hort. Kew. (2nd edit.) 
vol. v. p. 193. — Hook. FI. I.ond. t. 107. Blit. FI. p. 373. — Macr. Man. llvit. Bot. 
p. 227. — Hook. FI. Scot. p. 252. — Grcv. FI. Edin. p. 185. — Dick. FI. Abrcd. p. 53. 
— Ire. Lond. FI. p. 277. — Mack. Catal. PI. of Irel. p. 70. ; FI. Hibern. p. 277. — 
Orchis albida, Willd. Sp. PI. v. iv. pt. I. p. 38. — Sin. Engl. FI. v. iv. p. 18. — 
Winch’s FI. of Northumberl. and Durh. p. 56. — Orchis pusilla alba odaruta, 
radice palmata, Ray’s Syn. p. 381. — Pseudo-orchis alpina, t lore herbaceo, 
Mich. Gen. p. 30. t. 26. f. A. B. C. — Satyrium albidum, Linn. Sp. PI. p. 1338. — 
Iluds. FI. Angl. (2nd ed. ) p. 387. — Sm. FI. Brit. v. iii. p. 929. — Engl. Bot. t. 505. — 
With. (7th ed.) v. ii. p. 35. — Light. FI. Scot. v. i. p. 519. — Entaticus albidus, 
Gray’s Nat. Avr. v. ii. p. 205. 
Fig. 1. A separate Flower; a, braetea ; b, the germen; c. the spur. — Fig. 2. 
Front view of a Flower: a, a, a, sepals; b,b, petals; c, the lip ; d, the spur; 
e. the column and pollen-masses ; /, the germen. — Fig. 4. Summit of the Column, 
aud the Pollen-masses. — All, more or less, magnified. 
From peri, Gr. around ; aud stylos, Gr. a column. 
t See folio 8, note t. } See folio 33, note }. 
