V. PLANT,^: WRIGHTIAN^. 25 



LINAGE^.* 



69. LiNUM FERENNE, Llnii. ; Torr. Sf Gray, Fl. 1. p. 204. Hills of the San Pe- 

 dro River ; July. 



70. L. Berlandieri, Hook. Bot. Mag. t. 3480 ; Engelm. 8f Gray, PL Lindh. p. 5. 

 4" 2. p. 156. With the foregoing. 



71. L. RUPESTRE, Engelm. in PL Lindh. 2. p. 232. Prairies of Turkey Creek, 



* The following notes are contributed by Dr. Engelmann : — 



LINUM, L. (Dehiscence of the capsule only, or at least most readily, through the secondary, or false, 

 dissepiments!) 



Sect. Adenoltnum. 



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

 Saltillo, Sept. 1848. — Secondary dissepiments incomplete, with capillary fibres on their margins, much as 

 in L. Boottii. 



Sect. LiNOFSis. 



§ 1. Capsules 5-valved ; the secondary dissepiments more or less membranaceous, but entire ; styles 

 united to above the middle, mostly to near the apex. 



2. L. MULTicAULE, Hook. — L. hudsonioides. Planch., is a mere variety. Styles mostly united almost 

 to the tips. Capsule obtuse, as long as or a little shorter than the calyx ; the secondary dissepiments 

 entirely membranaceous, falling away to let the seed escape. Texas, from the coast (Houston and Victoria) 

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

 in all other species they fall off when the fruit ripens. 



3. L. AKISTATUM, Engelm. in PI. Wish p. 101. Leaves sometimes with stipular glands. False 

 dissepiments for the greater part membranaceous, with a narrow falciform cartilagineous part exteriorly 

 and infcriorly. — Between El Paso and Chihuahua. Wright'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 ligneous root. 



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

 rate, without stipular glands ; pedicels thickened at the end, forming a cup-shaped exterior caliculus ; styles 

 almost entirely united ; filaments subulate from a triangular base ; capsule not seen. (My specimens were 

 collected by Geyer, on the Upper Missouri.) 



Var. PtTBERULUM. Glaucous ; stems very much branched from the base, puberulent, or rarely glabrate ; 

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

 ceeding the calyx ; sepals glandulose-ciliate, the exterior 3-nerved ; filaments with an ovate-triangular 

 base, toothless ; styles united to the summit ; capsule rather shorter than the sepals, ovate, acutish, 5-valved, 

 the secondary dissepiments almost entirely membranaceous. — Santa Fe to the Cimarron River, Fendler, 

 No. 85. Prof. Gray in PI. Fendl. considered it a variety of L. Berlandieri, and in PI. Lindh. p. 157 as be- 

 longing to L. rigidum. From the former 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 the calyx, the smaller flowers, and the 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 herbarium, show precisely the same structure, and others rightly named " L. 

 rigidum " by Planchon have manifest stipular glands, although he 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-linear ; stipular glands often present, 

 but not always ; filaments lanceolate-subulate at the base ; capsules globose-ovate, subacute, 5-valved, the 

 secondary dissepiments partly (the upper and inner half) membranaceous. — From Galveston to the Bra- 



