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PLANT^ "n-RIGHTIANiE. 



25 



LINACE^.» 



«mm 



69. LiNUM PERENNE, Limu ; Torr. ^ Gray^ FL 1. 'p. 204. Hills of the San Pc- 



dro River ; July. 



70. L. Berlandieri, HooTc. Bot Mag. t 3480; Engehu Sf Grag^ Fh LindK p. 5. 

 ^ % p. 156. Witli tlie foregoiiij^. 



71. L, RUPESTRE, Engelm. in FL Lindk 2. p. 232. Prairies of Tiirkcy Creck, 



The following notes are contributed by Dr. Engelmann : 



■ 



LINUM, L. (Dehiscence of the capsulc only, or at least most readily, through thc sccondary, or false, 

 dissepiments!) 



Scct. Adenoltnum. 



L 



1. LiNUM PERENNE, Linn, Collected for the first time in Mexico by Dr. Gregg, in dry valleys near 

 Saltillo, Sept. 1848. — Secondary disscpiments incomplcte, with capillary fibrcs on ihcir margins, much as 

 in L. Boottii. 



Scct. LlNOPSIS. 



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^ 1. Capsules 5-vaIved ; the secondary dissepiments more or less mcmbranaccous, but cntlre ; styles 



united to above thc middlc, mostly to noar the apcx. 



2. L. 3IULTICAULE, Hook, — L. hudsonioidcs, Planch.^ is a mcre variety. Styles mostly unitcd almost 

 to the tips. Capsule obtusc, as long as or a little shortcr than the calyx; the secondary disscpimcnts 

 entirely mcmbranaccous, falllng away to let the seed escape. Texas, from the coast (Ilouston and Victoria) 

 to the West (N. Braunfels, Pierdenales, etc). — Sepals persistent, even after thc fall of the capsule, while 



in all other species thcy fall off whcn the fruit ripens. 



3. L. ARisTATUM, Engelm. in Ph WisL p, lOI. Leaves sometimes wnth stipular glands. False 

 dissepiments for thc grcater part membranaceous, with a narrow falciform cartilagineous part exteriorly 

 and inferiorly. — Between El Paso and Chihuahua. Wriglu's No. 72 is a smaller form of this species ; 

 the sepals rather less aristate; the flowers and capsules a little smaller, and with a large and perpendicu- 

 lar ligncous root. 



4. L. KiGiDUM, Pursh, Glaucous ; stem simple below; leaves, at least the upper oncs, glandular-ser- 

 rate, without stipular glands ; pedicels thickcned at the end, forminga cup-shaped exterior caliculus ; styles 

 almost entirely united ; filaments subulate from a triangular base ; capsule notseen. ^My spccimens wcre 

 collected by Geyer, on the Upper Missouri.) -^ '^*^ ^' % '' ' . ' A» 



Var. PUBERULUM. Glaucous; stems very muchbranched from the base, puberulent, or rarely glabrate; 

 leaves erect, lincar, 1-nerved, mucronate, a pair of stipular glands at thcir base; pedicels equalling or ex- 

 ceeding the calyx; sepals glandulose-ciliate, the exterior 3-ner\'ed ; filaments with an ovate-triangular 

 base, toothless ; styles united tp the summit ; caps\ile rather shorter than the sepals, ovate, acutish, 5-valved, 

 the secondary dissepiments almost cntirely membranaceous. — Santa Fe to the Cimarron Rivcr, Fendhr^ 

 No. 85. Prof. Gray in PL Fendl. considcred it a variety of L. Berlandieri, and in PL LindLp. 157 as be- 

 longing to L. rigidum. From the formcr it is distinguished by the glaucous appearance, the linear leaves, 

 and especially the small capsule with the almost entirely membranaceous secondary dissepiments. From 

 the latter, the absence of the calyculate cup below tbe calyx, the smaller flowers, and tlie entire leaves ap- 

 pear to separate it. [Dr. Engelmann inclined to consider this a distinct species ; but the capsules of true 

 L. rigidum, in the Hookerian herbarlum, show preclsely the same structure, and othcrs rightly namcd " L- 



' by Planchon have manifest stipular glands, althoughhe has not noticed them ; so that it would be 

 wrong, I think, to separate the present plant specifically. It is evident that the stipular glands do not fur- 

 nish reliable specific distinctions. A. G.] 



5. L. Berlandieri, Hook. Green ; leaves lanceolate or lanceolate-Iinear ; stipular glands oftcn prescnt, 

 but hotalways ; filaments lanceolate-subulate at the base ; capsules globose-ovate, subacute, 5-vaIved, the 

 secondary dissepimcnts partly (the upper and inner half) membranaceous. 



rigidum 



Frora Galveston to the Bra- 



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