OUR AMPHIBIOUS PERSICARIAS 231 
formes dense hirsutae et hirsuto-ciliatae. Calix breviter cam- 
panulatus roseo colore: stamina exserta; anhera_ versatilia: 
styli longi tenues usque infra medium furcati, longe exserti, et 
staminibus coaetanei vel juniores. Semen pro planta perparvum, 
nitidum, fuscum et crasse lenticulariforme. Floret haec species 
in planta terrestri tantum, a Julio usque Octobrem in carictis prope 
ad stagna. 
PLANTA AQUATICA VERNA AESTIVALIS semper, sterilis. Folia 
viridia ambabus faciebus, in aqua natantia, glabra, nitentia 
et limosa, elliptica-ovata vel elliptico-oblonga media parte latis- 
sima, cum basi obtusa, rotundata vel subcordata (in foliis superi- 
oris caulis), cum apice acuto, 5-11.5 cm. longa et 1-4 cm. lata 
(saepissime 3x9 cm.) Petioli tenues 1-4 cm. longi: internodi 
2-4 longi ubi folia virescunt, internodi inferioris caulis multo 
longiores. Nihil differt planta aquatica autumnalis praeterea 
quod folia sunt magis venosa et purpuata. Plantae ipsae aestivales 
et praesertim autumnales, ambae steriles, perrarae sunt et nun- 
quam nisi in vadis umbrosis inveniuntur. 
Terrestrial Phase. Plant about 6 dm. high, leaves 9-19 cm. long 
2-5 cm. wide, exclusive of the petiole which is 1 cm. long (some- 
times 2 cm. in glabrate broader leaved riparian plants, with rather 
wide borders to the ochrea, and long internodes, growing in shady 
places.) Leaves persistently covered on both surfaces with white 
soft silky spreading hairs and particularly on the ochrea and 
petioles of older p’ants, often in appearance somewhat tomentose, 
growing foliage white with more appressed soft hairs. Older 
ochrea more or less densely hirsute or hirtellous with soft hairs, 
and tipped with salver-shaped or campanulate herbaceous ciliate 
borders that gradually diminish in size upwards on the stem, 
and are seldom present even on sterile plants at blooming time, 
never on flowering terrestrials. Location in shady or sunny and 
dry places, varies only the amount and sparseness of the pubes- 
cence not its character. Leaves generally long narrowly lanceolate, 
with a rounded or obtuse base and a long acuminate, but finally 
blunted apex. When the plant is riparian, 7. e., still has its lower 
leaves aquatic, subaquatic or but lately emersed, the pubescent 
upper leaves are generally at least one half longer and one half 
narrower than the smooth lower ones. 
Specimens have been found of normal terrestrials with lower 
subglabrate leaves that evolved gradually by continued growth 
