86 TArAVKUACK.E. Arclomccon. 



Proc. Biol. Soc. Wash. vii. GG, 67, *t Coutrib. U. S. Nat. Herb. iv. 08, oD.^ [By 



B. L. EOBINSON.] 



* Capsule obovoid. 



A. humilis, Covu.le. Low, 4 to 7 iiKhcs in licight, erect leaves oWanceolatc, usually 

 2-3-ileiitate toward the apex, hirsute-ciliate ami sparsely villous: scapes naked and (ine- 

 Howered or more freijuently steins bearing a pair of subopposite leaves and 2-3-flowered : 

 petiils 4, suborbicular, white, three fourths ineli in diameter : filaments flattened and slightly 

 dilated : capsule 4 lines or more in length, two thirds as broad, splitting about to the middle : 

 style short but present. — Proc. Biol. Soc. Wash. vii. 67, & C'ontrib. U. S. Nat. Herb. iv. 58. 

 A. Califomicum, Gray, Proc. Am. Acad. xii. 53 (so far as Dr. I'arry's plant is concerned), 

 t. 2, not Torr. & Fre'm. — Desert of S. W. Utah, on the Rio Virgeu, Parry, no. O. 



A. Californica, Torr. & Frem. 1. c. Taller and much more densely clothed witli long 

 gray barl)ellate hair: leaves crowded at the base of the plant, oblanceolate in outline or 

 Habelliform-cuneate and several toothed at the apex : stem about a foot high bearing about 

 two alternate distant reduceil leaves and an umbelliform clu.ster of several to many slender- 

 pedunded successively t)pening flowers : filaments slender: stigma sessile. — Coville, Cou- 

 trib. U. S. Nat. Herb. iv. 58. — S. Nevada, first collected by Fremont, rediscovered in the 

 same locality near Vegas Ranch, Lincoln Co., by Dr. Merriam & V. Bailey. 

 * * Capsule linear-oblong. 



A. Merriami, Coville. Foliage and pubescence much as in the last, but flowers usuallv 

 solitary : sepals 3, villous, caducous : ])etals 6, white, ol)cordate, more tlian an inch iu 

 diameter: filaments slender but slightly dilated upward: cajKsule narrow, an inch and a 

 half or more iu length. — Proc. Biol. Soc. Wash. vii. G6, & Coutrib. U. S. Nat. Herb. iv. 59. 

 — Near the same locality as the preceding, Dr. Merriam & V. Bailey, May, 1891, no. 1890. 



5. SANGUINARIA, Dill. Bloodroot. (Named from the blood-red 

 juice.) — Hort. Elth. ii. 334, t. 252 ; L. Gen. no. 42.5. — Single species, vernal. 



S. Canadensis, L. Rootstock horizontal, fleshy and tuberous, crimson-red, surcliarged as 

 also the glabrous partly glaucous herbage with orange-red acrid Juice, sending up in early 

 spring, from terminal 2-3-valved buds a long-petioled leaf and a 1-flowered sca])e : leaves 

 reniforni, palmately and obtusely 5-9-lobed, reticulated : lobes repand-denlate or 3-li)bed : 

 scape a span high, naked (has been found with a pair of opposite bracts and 3 flowers 2) : 

 petals inch or less long, white, sometimes tinged with rose: capsule 2 inches long. — Spec. 

 i. 505 ; Lam. HI. t. 449 ; Curtis, Bot. j\lag. t. 162 ; Bigel. I\Ied. Bot. i. 75, t. 7 ; Lodd. Bot. 

 Cab. t. 1840; Torr. & Gray, Fl. i. 62; Gray, Gen. 111. i. 116, t. 49; Sprague & Goodale, 

 Wild Flowers, 141, t. 33. S. acuu/is, Moench, Meth. 227. -S. rernalis, Salisb. Prodr. 376. 



5. (jrandiflora. Sweet, Brit, Fl. Gard. ser. 2, t. 147. — Woods iu rich soil. Nova Scotia to 

 Manitoba, and south to Arkansas and Florida. 



6. DENDROMECON, Benth. (AeVVv, tree, /xr;/<o)v, poppy.) — Ti-ans. 

 Hort. Soc. ser. 2, i. 407 ; Benth. & Hook. Gen. i. 54; Hook. Ic. t..o7, & Hot. 

 Mag. t. 5134; Torr. Bot. Mex. Bound. 32, t. 3. — Single species, polymorphous 

 in foliage, yellow-flowered, in spring. 



D.* rigida, Benth. 1. c.^ Glabrous and rigid shrub; leaves palo r)r glanrescent, coriaceous, 

 lanceolate and cuspidate-acuminate, varying to oblong and obtuse with rigid mucro, entire 

 or ciliolate-denticulate on callous margins (those of seedlings slightly lobed), very reticulate- 

 veiny and venulose and with strong midrib, short-petioled, in age falling by an articulation : 

 flowers naked-pedunculate at apex of branchlets : sepals orbicular : petals very broad, about 

 inch long, golden yellow: capsule commonly arcuate at maturity. — Torr. & Gr:iy, Fl. i. 64 ; 



1 III the light of Mr. Coville's recent discoveries, and more copious material secured on llie De.itli 

 Valley Exploring Expedition, it has been necess.ary to rewrite the treatment of this sjeiins. 



2 A .second interesting anomalous form is described by A. Foerste (Bull. Torr. Club, xiv. 7-(, 

 t. 67), in which but two flowers are present and these alternate. 



3 De.scrii>tion .slightly modified to exclude the following species. 



