536 LOASACE^. Cevallia. 



ili 



well as to Acrolasial PresZ. "The seeds are reduced to one to each pla- 

 centa, placed one alf3ve the other. The hairs are jointed, and some of them 

 spinulose at the joints ; the spines verdcillate and reflexed." 



2. CEVALLIA. Lagasca, nov. gen. Sfspec. (1816) j)- H? t. 1. 



Petalanthera, Torr. mss. 



Limb of the calyx 5-parted ; the segments linear, erect. Petals 5, wholly 

 similar to the segments of the calyx, and inserted in the sinuses between 

 them, persistent. Stamens 5, inserted into the base of the calyx-segments, 

 persistent : filaments very short : anthers adnate, introrse, oblong, 2-lobed at 

 the base ; the connectivum prolonged into a linear tubular petaloid appen- 

 dage, nearly the length of the calyx-segments. Ovary coherent with the 

 tube of the calyx, 1-celled, with a solitary ovule suspended from the sum- 

 mit by a thickened funiculus : style short : stigma ovoid-capitate. Fruit 

 dry and indehiscent, obovoid, crowned with the persistent calyx and corolla. 

 Seed oval, filling the pericarp; the testa membranaceous, smooth and even: 

 albumen none. Embryo oval ; the cotyledons plano-convex, thick and 

 fleshy : radicle very short. — A branching (biennial or perennial ?) herb, 

 clothed with barbed and branching pubescence, and scattered pungent 

 bristles. Leaves alternate, sinuate-pinnatifid. Flowers in globose pedun- 

 culate heads. Calyx and corolla very villous, glabrous and colored within. 



C. sinuata (Lagasca ! 1. c.) — Petalanthera hispida, Nult. ! in jour. acad. 

 Philad. l.-p- 107. 



Sources of the Canadian River, near the Rocky Mountains, Dr. James ! 

 (New Spain, Nee, ex Lagasca !) — This very interesting plant was collected 

 by Dr. James in Long's Expedition, and was seA'eral years since communi- 

 cated to Mr. Brown under the manuscript name of Petalanthera. That 

 most learned botanist recently recognized its identity with the Cevallia 

 sinuata of Lagasca (described in the little work above-cited, which is ap- 

 pended to his Elcnchus jylantarum liort. Matritensi), and afforded us the 

 opportunity of comparing our plant with an original specimen received from 

 Lagasca himself. That author referred the genus to Boragineas ! The 

 pubescence consists of scattered rigid bristles, bulbous at the base and 

 minutely scabrous, small obtuse stiff hairs which are retrorsely barbed, 

 and very minute hairs with long verticillate branches. 



Order LVIII. TURNERACE^. 



Sepals united into an equal 5-lobed calyx, imbricated in sestiva- 

 tion. Petals 5, equal, inserted on the calyx, with a twisted aestiva- 

 tion. Stamens 5, alternate with the petals and inserted below 

 them, distinct : anthers introrse. Ovary free from the calyx, 

 1-celled, with 3 parietal placentae : ovules numerous : styles 3, 

 commonly branched or many. cleft at the summit, sometimes 6 (or 

 perhaps rather 3, which are 2-parted). Capsule 3-valved, loculici- 



