i8o 
F. TRACY HUBBARD 
Tirol. 6^: 156 (1906). P. viride var. subverticillatum Doell, in Mart. 
Fl. Bras. 2^: 173, in obs. (1877). Setaria decipiens C. Schimp. ex 
Nym. Consp. 787 (1842) in syn. sub S. ambigua. Chamaeraphis 
italica var. amhigita (Guss.) Ktze. Rev. Gen. PI. 2: 768 (1891). Pan- 
icum verticillatum B. amhiguum (Guss.) Aschers. & Graebn. Syn. 
Mitteleur. Fl. 2^: 75 (1899). Chaetochloa ambigua (Guss.) Scribn. & 
Merr. U. S. Div. Agrost. Bull. 21: 18, f. 7 (1900). Setaria verticillata 
subsp. ambigua (Guss.) Briq. Prodr. Fl. Corse i: 67 (1910). Panicum 
verticillatum var. antrorsum A. Br. ex Briq. I. c. i : 67 (1910) in^syn. 
Distinguished from the typical form of the species chiefly by the 
more open, verticillate or subverticillate panicle [especially toward 
the base] and by the main rhachis being scabrous or hispid on the 
angles instead of pilose. Setae antrorsely barbed otherwise in habit 
strongly suggestive of 5. verticillata. The setae often not much 
exceeding the spikelets. Fruit commonly greenish. 
This form is decidedly intermediate between 6". verticillata and 
5. viridis, commonly resembling the former in its verticillate or sub- 
verticillate panicle [occasionally S. verticillata is compact and only 
distinguishable from 5. viridis by the retrorse barbs of the setae and 
quite frequently 5. viridis is somewhat subverticillate] and the latter 
in the direction of the barbs of the setae. Of the two characters, the 
second seems to me to be more stable and of greater specific weight 
than the form of the panicle which is extremely variable in S. viridis, 
in fact in most of the Setarias: consequently I consider this form 
better treated as a variety of S. viridis than as a variety of S. verticillata. 
Good botanists have treated it both ways and still others have con- 
sidered it to be a separate species as will be noted in the preceding 
bibliography. I do not find any consistent characters to separate it 
specifically. 
Range. — Reported as a ballast plant collected by Scribner at 
Camden, N. J. (cf. Scribn. & Merr. U. S. Div. Agrost. Bull. 21: 18 
(1900)) and specimens seen from Washington, D. C, and Mobile, Ala. 
The first a weed in the Grass Garden, the second a ballast plant. 
Frequent in Europe more especially southward and also known from 
Algeria in Africa. 
Setara viridis (L.) Beauv. var. Weinmanni (R. & S.) Brand, in 
Koch, Syn. Deutsch. FL, ed. 3, 3: 2690 (1905): Fernald & Wiegand, 
in Rhodora 12: 133 (1910). 5. Weinmanni R. & S. Syst. Veg. 2: 
490 (18 1 7). Panicum purpurascens Opiz, in Flora 5: 266 (1822) 
