Vermischte neue Diagnosen. 247 
‚Differential Characters. P. Virginiana (L.) Benth. has the stem 
often less leafy (2—8 cm distance between the joints), the leaves usually 
narrower, firmer, more sharply serrate, and green beneath, the fruiting 
calyx oblong, 8—10 mm long, 5—6 mm wide, its teeth at length 
acerose-tipped, and the pale purple flowers 2,5 cm long, or more. P. 
parviflora Nutt. has the leaves thin and much less narrowed at the base, 
and its altogether purple flowers are very much smaller, usually 1 cm 
long (seldom 1,5 cm). 
438. Lobelia strictiflora (Rydb.) Lunell, l. c., p. 8. 
As the characters described in Rydbergs Flora of Montana (anno 
1900). p. 376, were found constant with a large number of plants from 
Butte and Towner, North Dakota, there is no doubt in my mind re- 
garding the advisability of classifying Lobelia Kalmü strictiflora as a 
distinet species. 
439. Aster laevis L. var. abbreviatus Lunell, l. c., p. 8. 
Stem 3 dm high or lower, leaves rather broad, ovate or rhomboid. 
On the prairié, not rare in gravelly soil. — North Dakota. 
440. Aster laevis L. var. sourisensis Lunell, l. c., p. 8. 
Stem 6—12 dm high; stem leaves rhomboid or rhombic, the lower 
often abruptly narrowed into winged petioles. Basal leaves with long, 
narrowly winged petioles, broadly ovate, or oval, or circular. In the 
timber at Minot, Ward Co. — North Dakota. 
441. Aster laevis L. var. undulatifolius Lunell, 1. c., p. 8. 
Leaves wavy-margined. In a thicket along the Saskatchewan river, 
Moose Jaw, Assiniboia. — North Dakota. 
442. Antennaria aprica Greene var. rosea Lunell, ]. c., p. 8. 
With rose-colored hracts. On the prairie at Towner, McHenry Co. 
Rare. — North Dakota. 
443. Lygodesmia juncea (Pursh) D. Don var. racemosa Lunell, 
Le, p. 8. 
Root, stems, leaves, flowers and achenes as in the main form, but 
the inflorescence is racemose. Among the main species sparingly at 
Minot, Ward county. — North Dakota. 
444. Plectaneia elastica H. Jumelle et H. Perrier de la Bathie in ,Le 
Caoutchouc et la Gutta-Percha“ (15. février 1908), p. 7, fig. 1, et p. 8, 
fig. 1, et 1. c., 15. Juin 1908, p. 6. 
Le piravaovao est une liane dont le tronc peut atteindre, à la base, 
Usqu'à 20 cm de diamètre. Ce tronc (fig. 1 A) est toujours recouvert 
de nombreux et gros mamelons lenticellaires, plus ou moins espacés ou 
Confluents suivant que la plante pousse à la lisiére du bois ou à l'in- 
lérieur. 
Les feuilles sont de formes trés variables, comme dans la plupart 
des Plectaneia, qui sont excessivement polymorphes. 
Sur les jeunes individus ou les trés jeunes pousses, ces feuilles sont 
minces et étroites. A peine pétiolées, elles sont lancéolées, en pointe à 
