— 712 — 
Synony ma. — A. urceolifer Mill. Dogb. of the distr. of Columbia, in « Proceed. Biol. Soc. 
of Washington », vol. XIII, pag. 85 (28 Sept. 1899). 
Ic. nostr.: tav. VIII, fig. 2. 
Staz. e loc. — Ne vedemmo i seguenti esemplari: 
Maryland. — District of Columbia, Brookland, 3 VII 1909, leg. E. L. Greene 
(Hb. Gr. ap. Hb. U. S. sub: A. medium Gr.: autot.!); Capitol View, 2 VII 1899, 
leg. G. S. Miller (in Hb. U. S. sub: A. urceolifer Mill.: autot.!). 
Connecticut. — Weston, 15 VII 1884, leg. A. L. Winton, in Hb. of 
W. E. Safford, n. 660 (in Hb. U. S. sub: A. pudescens R. Br.). 
Pennsylvania. — Vicinity of Georgetown, Lancaster Co., 28 VII 1890, leg. 
J. K. Small (in Hb. U. S. sub: A. androsaemifolium). 
West-Virginia. — Near Bucklin, 10 VI 1895. leg. W. M. Pollock, Ylora 
of Upshur Co. (in Hb. U. S. sub: A. camnabinum). 
Osservazioni. — La posizione sistematica di questa specie che, allo stato 
delle conoscenze, sembra localizzata in pochi punti degli Stati nord-orientali della 
Unione, fu egregiamente fissata dal Greene, il quale scrive (in loc. cit.): « Plants 
« perhaps not uncommon in the middle eastern States; being the A. androsaemi- 
« folium of the District of Columbia lists, but as exactly intermediate as possible 
« between that species and A. cannabinum... A. androsaemifolium is seldom if ever- 
« erect. Its branches are ascending: its foliage either spreading or deflexed, and all 
« its branches flower simultaneously; its corollas are pinkish or rose-color, exactly 
« campanulate and nodding. A. cannabinum is always strictly erect, nith ascending- 
« never spreading-foliage. Its branching is of the dichotomous order, the terminal 
« cluster of flowers always developping first, those of the lateral branches superseding 
« the first and appearing later. The corollas are green... never white or even tinged 
« with pink or rose; they are strictly erect, narrow and cylindrie. It should be noted 
« further that A. cannabinum is invariably light green as to the color of is herbage; 
« the other dark green, with a glaucous-pale under surface to the foliage. A. me- 
« dium has the general hue, the pinkish flower-color, and that simultaneous flowering 
« of all the branches which belong to androsaemifolium, but the habit, the leaf- 
« posture and even the leaf-outline that so distinetly characterise cannabinum. No 
« botanist seeing the plants when past flowering would their being A. cannabinum; 
«yet, as I have said, when in flower they are, in spite of all, taken as belonging 
«to androsaemifolium: yet the corolla is in its pattern not that of the last named, 
« but more nearly that of the other ». Non sarebbe possibile descrivere con più 
esatte parole (l'A. ha studiato le tre piante sul vivo!) lo stato di intermediarità 
della specie qui illustrata. Quanto poi ad —A. wrceolifer, di cui pure vedemmo gli 
autotipi nell’ Erb. Naz. degli Stati Uniti, i sottili caratteri escogitati dal Miller per 
differenziarlo da A. medium (« Calyx lobes narrow, about as long as tube of white, 
urceolate corolla; flowers about 5 mm. in lenght » =A. urceolifer; e « Calyx lobes 
broad, much shorter than tube of pinkish, suburceolate or tubular corolla; flowers 
about 6 mm. in length » = A. medium, sono tutti caratteri in fluttuazione, che non 
hanno valore specifico. Qui ricordiamo che il Miller cita, sempre per il distretto della 
