26 PLANTS WRIGHTIAN^. Y. 



W. Texas ; June. — This truly perennial species is nearly related to L. Boottii, 

 Planch., which, includes all that has been called L. rigidum from New England, 

 North Carolina, and Georgia. I have it also from Illinois. The distinctions of 

 these species are indicated by Dr. Engelmann, in the subjoined note. 



72. L. ARisTATUM, Engelm. in Wisliz. Mem. N. Mecc. p. 101. Locality not record- 

 ed ; probably from the valley of the Rio Grande, near El Paso, where it was detect- 

 ed by Dr. Wislizenus. 



zos, N. Braunfels, and the Pierdenales, Lindheimer, Sf-c. On the San Pedro River, Wright. — The latter 

 approaches a slightly glaucous form, with narrower and more rigid leaves, which occurs on the Cimarron 

 (^Wislizenus, Fendler, mixed with No. 85), often only two or three inches high, but much branched, with 

 manifest stipular glands ; the capsule ovate and acute. It appears very near to L. [rigidum, var.] puberu- 

 lum ; but the structure of the false dissepiments is decisive. 



§ 2. Capsules 10-valved. 

 * Styles united at the lase or below the middle. 



6. L. BooTiii, Planchon. Annual; styles in northern (St. Louis) specimens united at or below the 

 lower third only, in Texan specimens (/3. Planchon) almost to the middle ; capsules globose, acute, 10- 

 valved ; the secondary dissepiments incomplete, with numerous hair-like fibres on the margin. — No. 86, 

 PI. Fendl. belongs here, and not to L. rigidum. This is the only one of our species with a 10-valved cap- 

 sule, where the styles are somewhat united. 



** Styles free to the base. 

 t Secondary dissepiments incomplete. 



7. L. EUPESTRE, Engelm. in PI. Lindh. 2. p. 232. Capsule globose-ovate, acute or cuspidate, 

 like that of the foregoing species, but smaller ; secondary dissepiments exactly the same : distinguished 

 principally by the perennial ligneous root, the subulate leaves, the smaller flowers and fruit, and the entire- 

 ly free styles. — Found by Lindheimer about New Braunfels, and Camanche Spring ; by Wright (No. 71) 

 on Turkey Creek. Dr. Gregg collected it near Saltillo in June, and a variety, which may be named i3. 

 cymulosum, on the battle-field of Buena Vista in May ; this latter may be distinguished by the small and 

 crowded cymes at the end of the branches. 



8. L. Greggii (sp. nov.) : viride, glabrum, caulibus pluribus e rhizomate ligneo adscendentibus a basi 

 fruticulosa ramosis angulatis ; foliis alternis inferioribus oblanceolatis superioribus lanceolatis patulis ; 

 glandulis stipularibus geminis rarius inconspicuis ; cymis virgatis dissitifloris contractis ; pedicellis calyce 

 SEepius longioribus ; sepalis lanceolatis acutis trinerviis margine glandulosis ; filamentis basi brevi dilata- 

 tis 2-denticulatis ; stylis liberis ; stigmatibus cohaerentibus ; capsula depresso-globosa cuspidata calycem 

 subEequaute 10-valvi, dissepimentis secundariis incompletis. — Near Saltillo, Sept 1st, 1848, Dr. Gregg, 

 No. 387. — Stems about 10 inches high. Leaves similar to those of L. Virginianum, the capsule and seeds 

 of the same size. Distinguished from L. rupestre by the broader leaves, much smaller flowers and fruit, 

 the singular united stigmata, which I have found in all the flowers (and many of them) examined by me, 

 and the hairless false dissepiments. Apparently near L. Mexicanum, but that species has opposite leaves, 

 &c. [L. Mexicanum, at least the plant coll. Coult. 759, is a very different species, larger in all its parts, 

 with broad ovate sepals, not glandular on their margins. A. G.] 



tf Secondary dissepiments complete and similar to the primary ones : capsule splitting into 10 closed cocci. 



9. LiNUM Virginianum, Linn. Biennial (or perennial.?) with a fibrous root (all the others have a ta- 

 pering simple root). 



Var. /3. opposiTiFOLiuM : caule erecto ; foliis plurimis oppositis obovatis seu oblongis obtusis ; panicula 

 patula ; sepalis integerrimis late ovatis acutis ; petalis flavis. — Little Rock, Arkansas, in springy mo- 

 rasses with Sphagnum. Flowers smaller than in the usual form. 



Var. y. ANGUSTiFOLiuM : caule stricto ; foliis erectis ; panicula contracta sparsiflora ; sepalis lanceola- 

 tis capsulam superantibus, interioribus glandulosis ; petalis sulphurcis. — Western Arkansas, on sandy hills 

 :in open woods. Flowers and fruit larger than in the common form. 



G. Engelmank. 



