Vermischte neue Diagnosen. 243 
417. Morkillia Rose $ Painter in Smiths. Miss. Coll., L (1907), p. 33. 
The name Chitonia of Mocino & Sessé is a homonym of the Chitonia 
of D. Don, and hence a new name is here proposed. The genus is named 
Morkillia in honor of Mr. W. L. Morkill, general manager of the Mexican 
Southern Railroad, who has taken a great interest in and has contributed 
to the development of our explorations in southern Mexico. 
418. Morkillia mexicana (Moc. & Sessé) Rose & Painter, l. c., p. 38. 
Chitonia mexicana Mog. € Sessé; DC., Prod., I, 707; 1824. 
419. Morkillia acuminata Rose & Painter, l. c., p. 34. 
Near M. mexicana, but leaflets paler above, ovate and acuminate, 
more densely pubescent, flowers much smaller (6 cm or less broad), petals 
less notched, and fruit broader and nearly truncate at apex. 
North Mexico: Collected by Mr. E. W. Nelson on road over mountain 
between Victoria and Jaumave Valley, altitude 240 to 750 meters, May 31, 
1898 (no. 4444). 
420. Ribes madrense Coville & Rose in Smiths. Misc. Coll, L (1907), 
p. 32. 
Second-year branches light brown, somewhat pubescent; young 
.growth green, densely pubescent; prickles either simple or 3-branched, 
at first yellow, in age brown, 4 to 5 mm long; petioles 1,5 to 2 cm long 
pubescent; leaves more or less deeply 3-lobed, the lobes strongly toothed 
or cleft, more or less glandular and pubescent on both surfaces; peduncle 
pubescent; bractlets broadly ovate, obtuse; calyx tube 3 mm long; lobes 
of calyx 6 mm long, slightly hairy; petals about half as long as the calyx 
lobes, dark red; style glabrous; ovary glabrous; mature fruit not seen. 
Mexico: Collected by Ur. E. Palmer near Quebrada Honda, Durango, 
May, 1906 (no. 215). 
The only Mexican species which is at all near this is R. microphyllum, 
a plant distinguished by its stouter prickles, smaller leaves, somewhat 
different flowers, etc. 
421. Sagittaria arifolia (Nutt.) Smith var. 1. monomorpha Lunell in Bull. l 
Leeds Herb., no. 1 (Sept. 1907), p. 2. . 
Terrestrial or emersed. Stout and plump. Scapes 5—20 cm high, 
erect or ascendent. Petioles 4—18 cm long, usually curved outwards. 
Leaf blades all sagittate, broad, acute, with divergent basilar lobes. Bracts 
lanceolate, often as long as the fertile pedicels. Achenes about 2 mm long. 
422. Sagittaria arifolia (Nutt.) Smith var. 3. dimorpha Lunell, Le, p. 3. 
Only the lowest part of the plant is covered with water. Leaves 
abundantly developed and sagittate as in var. monomorpha, except 1 to 3 
lanceolate or oval, and 1 to 3 phyllodes. Turns into var. monomorpha 
under favorable conditions. 
423. Sagittaria arifolia (Nutt.) Smith var. 4 polymorpha Lunell, l. c., p. 3. 
A form showing characters mixed from the terrestrial and submersed 
forms, as part of the plant is exposed to the air, and part is submersed 
in the water. It has phyllodes, but comparatively fewer than var. cuneata. 
16* 
