38 



OX SEEDLINGS 



Hypocotyl very short or indistinguishable from the radicle. 

 Cotyledons linear or oblong-linear, obtuse, entire, with a strong 

 midrib, and alternate, lateral, ascending nerves, reticulate, petiolate, 

 and tapering into the petiole, glabrous ; lamina 1'5-1'S cm. long, 

 3' 5-5 mm. wide ; petiole flattened above, or shallowly grooved, 

 convex on the back, dilated at the base and perfoliate, glabrous, 

 4'5-ll mm. long. Individuals occur very frequently in which one 

 or both (fig. 415) of the cotyledons are bifid, bipartite, or divided 

 to the base, appearing in the last case double, that is, simulating 

 three or four cotyledons, instead of two. Where fission occurs 

 there is a distinct midrib to each lobe 

 of the cotyledon. 



Stem elongated the second season when 

 about to flower. 



Leaves simple, radical and cauline, al- 

 ternate, exstipulate, petiolate, glabrous or 

 variously pubescent or hairy in wild plants ; 

 petioles more than half terete, narrowly and 

 shallowly grooved above, glabrous or hairy, 

 green or stained with purple, much dilated 

 and sheathing at the base, striated with 

 slender ridges. 



No. 1. Cordate, obtuse, palmately five- 

 nerved, obtusely crenate-dentate. 



No. 2. Similar but trilobulate, and with 

 overlapping auricles at the base. 



Ultimate leaves pinnatisect ; lateral lobes 

 or segments cordate- or oblong-cordate, ob- 

 tuse, with overlapping auricles at the base 

 covering the primary midrib, alternately and ascendingly penni- 

 nerved, lobulate, obtusely and cuspidately serrate-dentate, subreticu- 

 late, especially on the under surface. 



Heracleum Sprengelianum, Wight et Am. 



Hypocotyl subterranean, or 4-6 mm. exposed. 



Cotyledons oblong, oval, or elliptic, entire, obtuse, l'T-1'9 cm. 

 long, 8-10 mm. wide, three- to five-nerved, glabrous, pale green, 

 shining ; petiole 1-2-2 cm. long, 1-2 mm. wide, flattened or sub- 

 channelled above, convex beneath, glabrous. 



Leaves radical, alternate, petiolate ; petiole dilated and sheathing 

 at the base. 



No. 1. Cordate, obtuse, shallowly five-lobed, obtusely dentate 

 or crenate, with mucro-tipped crenatures, palmately five-nerved 



PIG, 415. 



Peucedanum sativum. 

 Nat. size. 



