Mentzelia. LOASACE^. 535 



e 



9. M. mula : rough witli a miiuile barbed ])ubcscence ; leaves somewhat 

 lanceolate, intcrrii])ieilly i>iiiiiatiti(l, tlie seijnient.s obtuse ; flowers (laryr) ter- 

 minatinn tlic l)ranehes, not luaeteolate ; j)etuls 10; stamens very numerous; 

 tlie exterior filaments ])etaloi(l and often sterile, iheoiliers filitifrin ; capsules 

 3-valved at llie summit ; seed.-? luimcrous, winged. — Jiartouia nuda, ]\utl. 

 I. c. ; rursh, Jl. 1. p. 328, <^- 2. p. 749 ; DC. I. c. 



Gravelly hills of the Missouri, near the Great Bend, Nultall, Dr. .James! 

 July-Aug. — We have drawn up the character of this, as well as of tlie pre- 

 ceding species, wholly from the excellent and com])lele descri])tion of Nuttall, 

 as we possess only an imperfect specimen collected by Dr. James. The 

 flowers are about half the size of those of M. ornata ; and the rixjt, Mr. Nuttall 

 tliinks, is triennial or perhaps perennial. 



* * Flowers expanding only in bright sunshine, deep yellow. 



10. M. Itevicaulis : stem whitisli, smooth and somewhat shining when old ; 

 leaves lanceolate, sinuate-pinnatifid, sessile, somewhat canescent and sca- 

 brous -with minute multibarbate hairs ; flowers (very large and showy) 

 terminating the branches, often ratiier crowded ; bracteoles none, or subu- 

 late ; petals 5, or rarely 10, erecl-sjircading, lanceolate, acute at each end, 

 twice the length of the lanceolate-acuminate calyx-segments ; stamens very 

 numerous ; the 5 exterior filaments dilated and somewhat jjctaloid, but 

 antheriferous ; the others filitbrm ; seeds numerous, winged. — I'artonia 

 lajvicaulis, Dougl. I in Hook.fi. Bor.-Am. l.^>. 221, I. 69 ; Hook, if Am.! 

 but. Beecheij, suppl. p. 343. 



On the Oregon, Douglas! Nuttall! California, Douglas! June-.Iul}'. — 

 Flowers bright yellow, opening in sunshine ; the i)etals fully 2 inclies in 

 length. The minute tenacious pubescence consists of short and stout bristles, 

 barbed with recurved verticillate spines along their w hole length, as in M. 

 oligosperma ; with slender and pungent hairs intennixed, wliich are very 

 minutely denticulate, with the spines pointed upwards. 



11. M. immila (Nutt. ! mss. under Bartonia) : "rough with a minute 

 barbed pubescence ; stem low and rather stout, whitish, branching towards 

 the summit ; leavos lanceolate, sinuate-toothed or ])innatifid, the lower ones 

 somewhat petioled, the uppermost sessile ; flowers (small) solitary or 3 

 together, terminating the loose flowering branches, slightly pedicellate, with 

 1-2 linear-setaceous bracts at tlie base ; petals 10, lanceolate, acute, spread- 

 ing, longer than the lanceolate-subulate calyx-segments ; the inner ones 

 smaller; stamens very numerous; the outer filaments flat and somewhat 

 dilated ; capsules clavaie-cylindrical ; seeds numerous, winged." — 



" Bare hills on the banks of Ham's Fork of the Colorado of the West, 

 Oregon. July. — Plant 8-10 inches high. Root fusitbrm, fleshy. Cap- 

 sules 3-valved." Nuttall. — The flowers are rather larger than those of M. 

 oligosperma, yellow. 



12. M. micrantha (Hook. & Am. under Bartonia) : hispid throughout with 

 short hairs; stem erect, dichotomous, whitisli; leaves ovate, acuminate, 

 cuneate at the base, sessile, sinuate-pinnatifid ; flowers glomerate, sborter 

 than the floral leaf, ebracteolate ; jjetals 3, ovate, exceeding tlie cahx-seg- 

 ments ; stamens 15-20 ; five of the filaments petaloid and emarginale at die 

 apex ; capsules oblong-cylindrical, 3-seeded, 3-valved at the summit; style 

 slightly spirally twisted. Hook. Sf Am. — Bartonia micrantha, Hook. SfAm. 

 hot. Beechcy, suppl. j). 343, t. 85. (ined.) 



California, Douglas. — This species we have not seen, and the figure above- 

 cited is not yet published. It appears, as the authors who have described 

 it remark, to form a perfect transition from Bartonia, Nutt. to Mentzelia, as 



