260 
L., p. 383—Panicum bicorne, Sieb. ex Steud., Synox. Pl. Gram. 
(1854), p. 41, non Kunth. 
Hasskarl in Plantae Javanicae Rariores (1841), p. 12 also, 
refers to Panicum didactylum, Kunth, as a possible synonym of 
P. bicorne, Kunth, but his account of the plants referable or 
possibly referable to the species he is dealing with is so confused 
that no notice of his suggestion need be taken. 
From the indication of the distribution of Digitaria didactyla in 
Sprengel’s Systema Vegetabilium, vol. i. (1825), p. 270: “ Ins. 
Mascaren. Nov. Holland,” it might be inferred that the new 
Australian lawn grass was already then known and recognised ; but 
there is no doubt that “ Nov. Holland” was added owing to the 
supposed, but mistaken identity of Digitaria didactyla (Ins. 
Mascaren.) with Cynodon tenellus R. Br. (Nov. Holland), which 
latter is quoted J. c. as a possible synonym. 
Dr. A. Zahlbruckner kindly informs me that in the herbarium of 
the Vienna Hofmuseum there are two sheets of Sieber’s Agros- 
totheca no. 72 with labels in what appears to be Sieber’s hand- 
writing, one of them containing the indication “ Nova Hollandia,” 
the other “ Port Jackson.” Both had been named Digitaria 
didactyla by Hackel as well as by Mez. As no full description of 
igitaria didactyla exists, it may be useful to add one in this place. 
Digitaria didactyla, Willd. A perennial grass, growing in loose 
or dense tufts, 10-40 cm. high, when in flower, often throwing out 
- long (up to 40 em. and more) many-noded runners which root from 
the nodes and give rise to few or many intravaginal innovation- 
shoots and flowering culms, terminating finally in an ascending culm 
or fascicles of such culms. Innovation shoots often bulbously 
thickened at the base, at length branching from basal leaf-axils, 
thus forming new young tufts of culms. Runners and culms very 
slender, 0°5-1 mm. thick, more or less wiry, particularly the former, 
terete, glabrous ; terminal and subterminal culms like the runners, 
usually many-noded, internodes with the exception of the upper 
ones, usually 1-2°5 em. long or near the base shorter ; culms arising 
farther back on the runners, much shorter and with fewer nodes, 
most culm-internode) at length long exserted from the uppermost 
sheath, from 6 to over 15 cm. long, filiform, erect. Racemes, usually 
2, sometimes 3, rarely more, digitate, sessile or nearly so, 2-4°5 cm. 
