78 WILLIAM TRELEASE ON THE 



been collected on ballast at New York City (Brown).— PL 9, fig. 18; 10, fig. 5; 12, figs. 

 13-14. 



10. G. RoBEETiAiiruM, L. Spec, 681., G. inodorum, Don. A span to a foot and a half 

 high, erect or spreading-decumbent, puberulent and loosely glandular-villous, purple- 

 tinged, graveolent; leaves round-ovate, once or twice ternately divided, the ultimate lobes 

 oblong, coarsely acuminate-tootlied; stipules triangular, obtuse; pedicels half an inch or 

 less in length, erect in flower and fruit; sepals ovate, lanceolate, long-pointed, connivent; 

 petals rose-purple, 8-12 mm. long, spatulate, with long narrow claws; filaments glabrous; 

 beak 20-25 mm. long, with a long slender point, minutely glandular-puberulent; styles 

 free for about 1 mm.; divisions of ovary 1.5 X 2.5-3 mm., loosely wrinkled, sparingly pu- 

 bescent, breaking away from the style with 2 long white apical bristles; seed 1 x'2mm., 

 smooth. — Damp ravines, etc., [ffew Brunswick and Canada to Xew York, west to Min- 

 nesota and Missouri {fide Traci/s List) ; also found in Europe, Western Asia and 

 :N'orth Africa.— PI. 9, fig. 19; 10, fig. 10; 12, figs. 11-12. 



Our Greraniums are annuals, becoming biennial, with the formation of a tap-root in 

 some instances, or normally perennial, when they produce a larger or smaller rootstock 

 which is considerably branched in one or two species. A number are weak-stemmed, 

 and when these reach any considerable size they are decumbent, their enlarged nodes 

 possessing the sensitiveness to gravitation which is characteristic of the swollen nodes 

 of grasses^, etc., which causes the stem to form abrupt geniculate bends at the lower 

 joints. The pubescence consists of simple 1-cellcd pointed usually somewhat roughened 

 hairs, frequently appressed and, on the lower part of the stem at least, retrorse, in a 

 considerable number of species. Besides these there are in many species long, mostly 

 spreading, white hairs, consisting of a long basal cell, and a single row of shorter cylin- 

 drical cells above. In O. macidatam, and especially G. eriantlmm, these, which abound 

 on the calyx, often rendering it very villous in the latter, are tipped with rather small, 

 purple glands, frequently rudimentary in the former. In G. rotundifolium and G. Ricli- 

 ardsonii, though somewhat shorter and more rigid., they abound on the pedicels, etc., 

 still preserving their white appearance ; while in G. Fremontii, and especially G. incisum, 

 they are of a dirty-yellow color. As a rule, hairs of this class appear to be pretty con- 

 stant in their occurrence or absence in a given species; but some pedicels of G. caespi- 

 tosuyn are nearly or quite destitute of glands, while others, even on the same plant, are 

 evidently glandular-pubescent, and, judging from other plants, too much reliance should 

 not be placed on characters derived from the pubescence. (Note 1.) 



The inflorescence of Geranium is essentially cjnnose, the stem ending in a 1- or, mostly, 

 2-flowered peduncle, while lateral peduncles arise from the axils of the cauliue leaves in 

 simple plants of the maculatum type, their ultimate branches likewise ending in paired 

 pedicels. In G. maculatum the lateral peduncles are sometimes more than 2, and bear 

 reduced leaves, while in its western representatives they are regularly leafy and elon- 

 gated, but otherwise similar. There is at first sight little to connect the more branched 



' Ou G. Huhcrlianvm, sec KiUzoii ; Bot. TiJsskrift, xii; Just's Jahresbericlit, ix, 4l'0. 



