i l 'i i h. PRAIN. REVISION OF THE GENUS CHELIDONIUH. 



Stylophorum diphyllum Nuit. Gen. II. 7 (1818); Spreng. Syst. II. 570 (1825); 

 Don, Gen. Syst. I. 138 (1831); Dietr. Syn. III. 223 (1843J; Gray, Gen. I, 114. t. 

 18 (1848); Hook. Bot. Mag. l. 4867 (1855); Lesquer., Fl. [rkans. 348 (1860); 

 Gray, Manual Ed. V. 23 (1866), Ed. VIII. 59 (1878); Chapm. Flor. S. Unit. St. 

 Ed. II. 605(1883). 



S. petiolatum Nutt. Gen. II. 8 (1818); Don, Gen. Syst. I. 135 (1831); Dielr. 

 Syn. III. 223(1843). 



S. ohioense Spreng. Sys/. II, 570 (1825). 



afeconopsw dtpÄyZto DC. Syst. Veg. II, 88 (1821); Prodr. I, 121 (1824); 

 Torrey, Compend. 216 (1826).; Eaton. Manual Ed. VI, 221 (1833); Torrey 

 and Gray, /<7. IV. .1///. 1.61(1838); Eaton and Wright, V. .1//*. /y«/. 315(1840); 

 Wal|». Rep. I. HO (1842); Beck, U. S. Bot. 20 (1848); Wood, Bot. and Fl. :!_> 

 (I87D. Class-Book 224 (1880). 



.1/. petfofata DC. Sjfs*. Tej/. II. 87 (1821); Prodr. I, 121 (1824); Torrey, 

 Ann. Lyc. X. Y. II, 16o (1828) ; Eaton, Manual Ed. VI. 221 (1833);Beck, U. 

 S. Hot. 20 (1848). 



North. America : Eastern United States; not uneommon. 



Rootstock 1 l /a in. long heads 1/3 in. across; stems 9-15 in. long; radical 

 leaves 6-16 in. long, lamina 7 in. long, 3 in. wide, pétioles 6-9 in. long; seg- 

 ments 2-(rarely 3-) jugate basal pair rather smaller, lateral 1 72-3 in. long, 

 ü 4-2 in. wide end lobe 2-3 in. long, 2-3 in. wide; floral (occasionally 3 instead 

 of 2 [= S. petiolatumj) with pétioles 1 72-2 in. long, lamina 1-jugate (basal 

 smaller segments absent) ; sepals 1/3 in. long, buds 1/4 in. diam. ; flowers 1 72 in 

 across, pedicels 2-3 in. long, braets ovale acute: capsule (iiicluding st\ le 1 7-1 •*> 

 in. i 1 in. long, 13 in. diam. 



Besides its isolated distribution, the ehief peculiarity of this species 

 is its usually 4-valved capsule. In habit it closely resembles C. hi*i<>- 

 carpum but it bas very differently shaped leaves wbicb more resemble 

 those of C. majus. The 4-valved fruit serves to eonnect the genus as a 

 whole and the tribe to which its belongs witb the Ewpa/pavereae. There 

 is no différence between the two species distinguished by Nuttall. 



§ III. HYL0MEC0N Prain. 



5. Chelidonium japonicuni Thunbg; green, glabrous or when 

 young sparsely puberulous; rootstock sbort slender oblique scaly, 2-4 

 headed; radical leaves few very long-petioled, pinnatisect segments 

 approximated oblong-lanceolate or subrhomboid acutely serrate or 

 laciniate, terminal lobe incised or 3-fid ; stems solitary from each boad 

 of rootstock, leafless below, simple witb two, rarely tbree, more rarely 



