634 PROCEEDINGS OF THE AMERICAN ACADEMY. 



apice curvatus, sub lente leviter bifidus. —Santa Eulalia Mountains, 

 Chihuahua, April, 1885, Pringle, no. 133 (type, in hb. Gray), dis- 

 tributed as 11. costata Gray. Its nearest affinity is with H. plicata 

 Torr. From this species it is at once distinguished by the color of the 

 foliage and shape of the leaf-base. Hedeoma costata Gray, based upon 

 Ghiesbreght's no. 815, was obscurely published in the Synoptical Flora 

 in 1878 (Vol. II, Part II, p. 363), and thus has priority over Hemsley's 

 //. costata, published in the Biologia Centrali- Americana. This is in- 

 deed fortunate, for although Hemsley's description was drawn up 

 from Grhiesbtkght, no. 815, the first specimen which he cited, Palmer, 

 no. 1095, from Chihuahua, is clearly the more recently published 

 H. Pringki Briq. (including H. permixta Briq.). True H. costata is 

 represented in the Gray Herbarium by only the type specimen from 

 Chiapas, and is doubtless a species of strictly southern range. Speci- 

 mens which have been distributed under the name are for the most part 

 H. plicata Torr., a species which, to judge from the material at hand, is 

 confined to the arid region of northern Mexico and the southwestern 

 United States. 



Hedeoma quinquenervata, n. sp. Herba perennis ca. 2 dm. alta, 

 ubique cano-pubescens, caulibus e basi lignosa numerosis, sparsim 

 ramosis vel simplicibus. Internodia media 3-4 cm. longa. Foliorum 

 laminae usque ad 12 mm. latae, 18 mm. longae, basi obtusae, apice 

 obtusiusculae vel acutae, margine leniter revolutae, subargute 10-12- 

 denticulatae, exigue punctatae, utrinque permanenter pubescentes, 

 supra virides, subtus pallidiores, nervis alterutrinque 5(-6), ad denticu- 

 lorum apices terminantibus, solum subtus prominulis. Petioli usque 

 ad 5-6 mm. longi. Verticillastri plerumque 7-flori axillares in caule 

 summo aggregati, folia bractiforma occultantes, pedunculis usque ad 

 2 mm. longis. Pedicelli 4-6 mm. longi. Bracteolae omnes uniformes 

 pedicellis multo breviores lineares. Calyx maturus 9 mm. longus 

 anguste cylindricus antice levissime gibbosus, intus a pilorum annulo 

 obseptus, valde nervosus ; labri dentibus aristiformibus leviter incurva- 

 tis quam eis labioli divergentibus vix longioribus. Corolla 18 mm. 

 longa extus minute puberula, e basi tenui sursum gradatim ampliata, 

 labro oblongo apice truncato emarginato ; labiolo trilobo, lobis laterali- 

 bus semiovatis, medio oblongo apice truncato. Stamina antica fertilia in 

 tubo summo inserta vix labioli lobos superantia, duo postica 1 mm. longa, 

 longe infra alia inserta, antheras capitatas nee polliniferas gerentia. 

 Stylus nudus integer. — Sierra Madre, Monterey, State of Nuevo Leon, 

 Pringle, no. 10,241 (type, in hb. Gray). A species most closely allied 

 to Hedeoma tenella Hemsl., but differing in the nervation of the leaves, 

 the more profuse and persistent pubescence, and the larger flowers. 



