1919] Fernald,— Two new Myriophyllums 123 
Similar to M. exalbescens; the stem branching, becoming white 
when dried: leaves mostly in 4's, 1-2 em. long, with 3-7 pairs of capil- 
lary flaccid segments 0.5-1.3 cm. long; the upper emergent ones 
elongate-oblanceolate or linear, short-pectinate or subentire: spikes 
terminal, with the rhachis filiform; flowers verticillate, the lower 
pistillate, the upper staminate, sessile: bracts elongate, linear- 
oblanceolate, conduplicate, up-curved at the end, entire or the lower 
pectinate, 0.3-1 cm. long: bractlets ovate, 0.6-0.8 mm. long: petals 
ovate-oblong, concave, 1.5 mm. long: stamens 8; anthers oblong, 
1.5 mm. long (immature); fruits subglobose, 3 mm. long, very broadly 
4-suleate; the merocarps with rounded rugose backs.— MAGDALEN 
ISLANDS, QUEBEC: shallow ponds among the sand hills between East 
Cape and East Point, Coffin Island, August 17, 1912, Fernald, Long & 
St. John, no. 7,843 (TYPE in Gray Herb.). 
In the whitening of its stem M. magdalense simulates M. exalbes- 
cens from which it differs in the elongate, entire or subentire upper 
leaves, the elongate bracts, the very short petals and especially in the 
very broadly and openly sulcate fruits. From M. spicatum it 
differs in the whitening stem, the few capillary and flaccid segments 
of the leaves, the elongate bracts (sometimes found also in varieties 
of M. spicatum), the ovate bractlets, the short petals and anthers, 
and in the very characteristic fruit, the fruits of M. spicatum being 
slenderly sulcate as in M. exalbescens. 
Unfortunately the material of M. magdalense is mostly immature, 
only one plant being found with good fruit. The species filled a 
single small pond to the exclusion of other species and flowered freely 
so that a visit in September should yield abundant fruiting material. 
The Myriophyllum of neighboring pools was M. exalbescens and in a 
single station M. verticillatum, var. intermedium Koch, which appar- 
ently has not heretofore been found in North America. 
In the Gray Herbarium, among the various species which have been 
erroneously called by their collectors Myriophyllum verticillatum is a 
sheet from Farewell Bend, Crook Co., Oregon, collected in July, 
1894 by J. B. Leiberg (no. 465), which is quite unlike any recognized 
North American plant. In its very glaucous or blue-green, emersed, 
broad, entire or variously serrate Ieaves-and the tendency of the 
inflorescence to fork it is unique among American plants as it is in the 
very dong (2 mm.) slenderly triangular, serrate bractlets. This 
plant proves to be a well known species of the southern hemisphere, 
