J. C. ARTHUR. CONTRIBUTIONS TO FLORA OF IOWA NO. IV. 171 



The following' descriptions are of plants in this list not described 

 in Gray's Manual, 5th edition. 



Artemisia sekkata, Nutt. — Stem tall and herbaceous; leaves lanceolate, 

 acuminate at either extremity, margin serrate, upper side smooth, under to- 

 mentose and white; flowers paniculate, partly glomerate, erect; calj'x small 

 cylindric-ovate, and nearly smooth. — Near the Prairie du Cliien, on the 

 banks of the Mississippi, also on the banks of the Missouri, in open alluvial 

 soils. Stem 5-(i feet high. NrittulVa Genera, II, 142. 



Senecio lugens, Bichdrdx. — Perennial, white-toraentose, deciduously Ian- 

 ate or nearly smooth ; stem t.^-3 feet high, often several from one root ; leaves 

 obscurely veined, 2-8 inches long, i^-2 inches wide, the radical obtuse, nar- 

 rowed into a petiole, cauline sessile and parti}' clasping; heads variable in 

 size, usually rather large; involucre with a few bractlets at the base; scales 

 linear-lanceolate, acute, with blackish-purple tips ; rays 10-12, oblong-linear, 

 twice as long as the involucre ; achenia glabrous. 



Yiir. HooKKUi, Edioii. — Deciduously tomentose or smooth ; stem simple; 

 leaves entire or glandular-toothed, the radical oblong-spatulate, cauline lah- 

 ceolate, acute, clasping; corymb dense; .scales of the involucre conspicu- 

 ously sphacelate. Flor. Col., Port, d- Coul. 



Pi;Antago Rugelii, Bectn-sne. — Leaves paler than in P. major, commonly 

 thinner; spikes long and thin, attenuate at the apex; sepals oblong, all as 

 well as the similar bracts acutely carinate; capsules erect in the spike, cyl- 

 indraceous-oblong (somewhat over 2 lines long, one-sixteenth inch in diame- 

 ter), about twice the length of tha calyx, circumscissile much below the mid- 

 dle ; ovules 6-10 ; seeds 4-9, oval-oblong (about a line long), opaque and dull 

 brown, not reticulated. — P. Kamtitchatica, Hook. Gray's Manual, ed. 5, not of 

 Cham, Canada to Illinois and south to Georgia and Texas; probably truly 

 indigenous, as no trace of it is found in the Old World. Gray's Synop. Fl. 

 N. Amer. 



Gerardia tenuifolia, Vahl., var. macrophylla, Benth. — Stouter; leaves 

 largei', 13^2"'^ inches long and almost 2 lines wide, scabrous; pedicels as- 

 cending; calyx-teeth usually larger; corolla little over i^ inch long. West- 

 ern Iowa to Colorado and W. Louisiana. Gray's Synop. Fl. N. Am. 



CuscuTA Groxovii, Wi'lld.. var. latiflora, Engehn. — A form with flowers 

 of more delicate texture, and shorter tube and longer lobes to the corolla. — 

 G. Snururi, Engelm. in Am. .lour. Sci., vol. 48, with figures. Common 

 northward. Gray's Syn. Fl. N. Am. 



Polygonum Miirlenbergii, Watson. — Perennial, in muddy or dry places, 

 often 2-3 feet high, scabrous with short appressed or glandular hair's, espec- 

 ially upon the leaves and upper stems; leaves thin, rather broadlj^ lanceo- 

 late, long-acuminate, usually rounded or cordate at base, 4-7 inches long, on 

 short stout petioles (U'-l inch long) from near the base of the naked sheath; 

 flowers and fruit nearly as in P. amphibium. but spikes more elongated (1-3 

 inches long), often in pairs. — New England to Texas and westward to 

 Washington Territory and N. California. P. amphibium, var. MuJdenberfjii, 

 Meisn. in DC. Prodr., and including most of the var. terrestre of American 

 botanists. Proc. Amer. Acad., ATT', 1879. 



Aristida pukfurea, Nuti. — Perennial ; culms 6-15 inches high, simple, 

 erect, slender, mostly glabrous; sheaths narrow, scabrous, exceeding the in- 

 ternodes, pilose at the throat; leaves very narrow, convolute, J^^^-f^ inches 

 long ; panicle slender, erect or flaccid, 3-6 inches long, loosely few-flowered ; 

 glumes purpli.sh, the upper one 6-9 lines long, about twice' exceeding the 

 lower, and longer than the flower, bifid and shortly awned ; flower densely 

 short-pilose at the base, scabrous above, 6 lines long, the awns equal or near- 

 ly so, separate to the base, not jointed, 1-2 lines long, scabrous. — From 

 Western Texas and New Mexico to Arkansas and Colorado. Watson in 

 King's Rep. 



