Kaszab Zoltán (szerk.): A Magyar Természettudományi Múzeum évkönyve 75. (Budapest 1983)
Kováts, D.: Distribution of internode lengths of two Lithospermum species (Boraginaceae)
mostly branch to three (cymes trichasia), but sometimes in the upper second half of shoots branch to two and again branch to two (cymes dichasia). The branches of flowering shoots of Lithospermum arvense L. show greater diversity. The small slender only one-year old specimens do not have branches in most of the cases. The two-year old specimens branch almost without exception. The best grown branches are at the bottom of the main axes or they are situated in its upper third, or they are on both parts of the specimens. Between these two parts of the axes mostly smaller branches are found. The branches are also usually three in the upper part of the shoots, while the branches vary between three and ten at the bottom of the specimens. Considering the lengths of internodes, the curves with one maximum are quite frequently found in Lithospermum arvense L. That means the lengths of internodes increase from below to upwards, about at the middle of the shoots are the longest internodes and towards the top of the shoots they get more or less evenly increasingly shorter. Nearly without exception this is found in the one-year old shoots without branches (Fig. 3). The shoots branching in the upper parts are divided into two parts: there are typical curves with one maximum (Fig. 4) and there are curves typically with two maxima too (curve S, Fig. 5). In the latter cases the first "smaller maxima" are much smaller than the Fig. 5. Distribution of internode lengths Fig. 6. Distribution of internode lengths of a flowering shoot of a two-years old flowering shoot of of Lithospermum purpureo-coeruleum L. (curve S, with two Lithospermum arvense L. (curve S, maxima) with two maxima)
