( 225 .) 
P I S U M * *. 
Linnean Class and Order. Diade'lphia f, Deca'ndria. 
Natural Order. Legumino's,*:, Juss. Gen. PI. p. 345. — Sm. 
Gram, of Bot. p. 174. — Lindl. Syn. p. 75. ; Introd. to Nat. Syst. of 
Bot. p. 87. — Rich, by Macgilliv. p. 532. — Sm. Engl. FI. v. iii. p. 
259. — Loud. Hart. Brit. p. 509. — Don’s Gen. Syst. of Gard. and 
Bot. v. ii. p. 91. — Leoumina'ce/E, Loud. Arb. Brit. p. 561. — 
Papiliona'ce^e+, Linn. — Rosales; sect. Cicerina; ; subsect. 
Lotianaj; type, Lathyracea; ; subtype, Vicida=:; Burn. OutL 
bf Bot. pp. 614, 638, 642, 659, & 661. ‘ 
Gen. Char. Calyx (fig. 1.) inferior, cup-shaped, permanent; 
the margin in 5 pointed segments, the 2 superior ones the shortest. 
Corolla (fig. 2.) butterfly-shaped, of 5 petals ; standard (fig. 3.) 
broadest, inversely heart-shaped, reflexed, notched, with a pair of 
protuberances at the inner side near the bottom, its claw vaulted ; 
wings (figs. 4 & 5, a, a. and fig. 6.) inversely egg-shaped, converg- 
ing above, shorter than the standard, with wavy, strap-shaped claws ; 
keel (figs. 4 & 5, b ) half-moon-shaped, compressed, of 2 oblong, 
cohering, folded petals, smaller than the wings, and with narrower 
straight claws. Filaments (figs. 7 & 8.) 10, nine united, (fig. 8, a.) 
for more than half their length, into one compressed keeled tube, 
open along its upper edge, which is closed by the tenth, separate, 
flattish, awl-shaped filament (see fig. 7. and fig. 8, b). Anthers 
(fig. 8, a.) small, roundish. Germen (fig. 9.) oblong, compressed. 
Style (fig. 8, c.) ascending, triangular, membranous at the edges. 
Stigma longitudinal, downy, united to the acute upper edge of the 
style. Legume (figs. 10 & 11.) large, oblong, rather compressed, 
but not winged ; of 1 cell and 2 concave valves. Seeds (see f. 1 1 .) 
globose, numerous, with a roundish hiliim. 
Distinguished from other genera, in the same class and order, by 
the leafy segments of the calyx ; the triangular style ; and the downy 
stigma attached to the prominent upper edge of the style. 
One species British. 
PISUM MARl'TIMUM. Sea Pea. 
Spec. Char. Stem angular. Petioles flattish on the upper side. 
Stipulas broad, half-arrow-shaped. Peduncles many-flowered, the 
length of the leaves. 
Engl. But. t. 1046. — Hook. FI. Lond. t. 5. — Linn. Sp. PI. p. 1027. — Willd. 
Sp. PI. v. iii. pt. ix. p. 1071. — Huds. FI. Angl. (2nded.) p. 313. — Ait. Hort. Kew. 
1st ed. v. iii. p. 37. ; 2nd ed. v. iv. p. 302. — Sm. FI. Brit. v. ii. p. 760. Eng. FI. 
v. iii. p. 270. — With. (7th ed.) v. iii. p. 835. — Gray’s Nat. Arr. v. ii. p. 612. — 
Lindl. Syn. p. 84. — Hook. Brit. FI. p. 324. — Rev. G. E. Smith’s PI. of S. Kent, 
p. 39. — Don’s Gen. Syst. of Gard. and Bot. v. ii. p.331. — Mack. Catal. of PI; 
: Fig. 1. Calyx. — Fig. 2. Corolla. — Fig. 3. The Standard. — Figs. 4 & 5, the 
Wings and Keel; a, a. the wings; b. the keel.— Fig. 6. One of the Wings. — 
Fig. 7. Calyx and Stamens. — Fig. 8. Stamens, Germen, Style, and Stigma; 
a, 9 of the Stamens, with their filaments united ; b, the upper, single Stamen.— 
Fig. 9. Germen, Style, and Stigma. — Fig. 10. A Legume. — Fig. 11. The same 
opened to show the seeds. 
* Pis in Celtic means a pea ; hence pisum in Latin. Don. 
+ See Spdrtium scopdrium, f. 77. n. t- 1 See lAthyrut latifilius, f. 1 17. n. \t 
