56 PLANTZ FENDLERIANZE. 
Santa Fé Creek; August. Although destitute of fruit, the specimen well agrees with 
the European plant. Perhaps it is also the Sium pusillum of Nuttall. I have the same 
plant, in flower only, from Michigan. 
272. Arcuemora Fenpueri (sp. nov.) : radice fasciculato-tuberosa; caule simplici ; 
foliis pinnatis 5 —7-foliolatis ; petiolis basi spathaceis; foliolis oblongo-ovatis obtusis vel 
fol. supremorum lanceolatis inciso-serratis utrinque viridibus ; involucellis nullis; fructibus 
parvulis angusto-alatis. — Margins of Santa Fé Creek, in fertile soil; June, July.— This 
is clearly a congener of Archemora rigida, although it wants the involucels. ‘The root 
consists of three or four oblong, fasciculated, and pendulous tubers about an inch long. 
Stem slender, one to two feet high. Cauline leaves two or three. Leaflets three fourths 
of an inch to an inch and a half long; those of the radical and lower cauline leaves ovate 
or oblong, obtuse ; all incisely serrate throughout ; not barely 2 —3-toothed, as in A, rigida. 
Umbel small. Fruit hardly two lines in length, oval; the wing-like margins narrower 
than the disk. Vitte of the commissure four, of which two are shorter, as is often the 
case in A, rigida. 
273. Heracteum tanatum, Miche. With the preceding; June, July, in flower. 
274. Cymoprerus Fenpieri (sp. nov.) : pumilus, subcaulescens ; foliis viridibus 
2-—3-pinnato-partitis ambitu oblongis vel ovato-lanceolatis pedunculos excedentibus, pin- 
nis segmentisque 5 —7 oblongis obtusis incisis superioribus confluentibus, rachi latiuscula; 
umbella glomerata pauciradiata ; involucro obsolete; involucellis unilateralibus herbaeeis 
8 —5-partitis flores luteos zequantibus, laciniis oblongis ; fructibus plerumque 7-alatis, alis 
membranaceis planis. — Gravelly hills, Santa Fé; April to May. — Stem one to two 
inches long, rising from a thickened perpendicular root or caudex. Petioles and pedun- 
cles about the same length, minutely pulverulent-glandular. Leaves thickish, not glau- 
cous, the lamina of the larger two inches long; the pinne and segments little crowded. 
Flowers crowded in the moncecious umbellets, on very short pedicels; the central ones 
staminate ; the marginal pistillate. The fruit is not mature, but nearly resembles that of 
no. 275: one of the mericarps bears two (usually unequal) wings on the back; the other 
only one. It is a well-marked species. 
275. C. monranus, Nutt. in Torr. & Gray, Fl. 1. p. 624. With the preceding, 
in one locality only; April, May.— The specimens accord very well with an authentic 
one from Nuttall (in herb. Torr.), except that the foliage is more glaucous, and the seg- 
ments of the leaves more crowded, in these respects more nearly resembling C. glaucus. 
But the species is well characterized by the conspicuous scarious and silvery white, some- 
what cyathiform involucre and inyolucels, marked with greenish ribs, each about 5-part- 
ed, the involucels into obovate and obtuse entire divisions, the involucre into similar or 
