Theodor Holm : Types of Claytotm Gronov. 7 



Alsinastrum. 

 Claytonia Chamissonis Esch. (Plate II fig. 3). 



From all the other species of Claytonia this is very distinct by the stem-leaves being 

 opposite, and by producing stolons; from those described above Cl. Chamissonis shows 

 a marked difference by the stem-internodes being stretched, and by the aerial stem being 

 branched; these lateral branches are sometimes purely floral, or they develop several 

 pairs of opposite leaves before the flowers appear. In this species the primary axis, 

 as well as the lateral, becomes terminated by an inflorescence, of which the fore-leaves 

 are generally of very unequal size, the one subtending the lateral, floral branch being 

 frequently a mere scale. The inflorescence is sometimes an ample cyme with the central 

 flower very distinct, and with two lateral cymes passing into monochasia, but in no case 

 have we observed the fore-leaves so distinctly represented as in the members of Euclay- 

 tonia and Limnia. Now in respect to the stolons these develop from the axils of the 

 cotyledons already, or from the uxils of the lower stem-leaves in specimens as the one 

 figured (Plate II fig. 3) which has developed from a bulb; this figure shows the stolons 

 consisting of slender, stretched internodes with small, opposite, scale-like leaves, and 

 either terminated by a pointed bud or by a bulb with fleshy leaves; in this specimen 

 the root-system is poorly represented, being reducod to some few secondary roots from 

 the mother-bulb. In the seedling the primary root is quite long, but very slender, and 

 does not persist; the cotyledons are epigeic. 



Some few points may be mentioned in regard to the internal structure viz.: tho 

 stolons do not increase in thickness, but they contain deposits of starch in the cortex, 

 and endodermis is sHghtly thickwalled. The leaves possess stomata on both faces of 

 the blade, although the chlorenchyma shows a typical, dorsiventral structure; neither 

 collenchyma nor stereome was observed in the loaf, and the mestome-strands an» only 

 surrounded by thinwalled parenchyma-sheaths, deeply embedded in the chIortMichyma. 



Naiocrene. 



Claytonia parvifolia Moo. (Plate II fig. 4). 



A perennial plant with the habit very difTerent from that of the species of the other 

 sections. The primary shoot is erect, but very short, and terminated by a roseite of 

 leaves; filiform, secondary roots push out from the short, subterranean intomodes; the 

 flower-bearing stems are simple, very slender, asi^ending or frequently procumbont, aud 

 they are; lateral, being developed in the axils of the leaves. Furthermore, very charac- 

 teristic of the plant is the alternate position of the cauline leaves, and the dovelopment 

 of small bulblets in the axils of several of these; these bulbiets are dcciduous, and able 



