ROBINSON. — NEW SPERMATOPKYTES, CHIEFLY FROM MEXICO. 39 



but it differs from that species in its decidedly smaller untoothed 

 leaves, which are rounded at the apex. 



Zinnia tenella Robinson, n. sp., erecta gracilis annua tenuiter pilis 

 subappressis griseis in novellis copiose pubescens in parte inferiore 

 simplex supra saepissime 3-5-ramea 1.5-2.7 dm. alta; foliis tenuibus 

 lanceolatis integris utrinque viridibus appresso-puberulis et sparse 

 atomiferis obtusiusculis 3-nerviis patentibus vel derlexis basi cuneatis 

 brevissime petiolatis 1.5-3.5 cm. longis 4-10 mm. latis ; capitulis sae- 

 pissime 1-5 terminalibus graciliter pedunculatis erectis ca. 7 mm. diarn- 

 etro (ligulis exclusis) aequi-altis ; involucri campanulati squamis paucis 

 (ca. 8) late oblongis obtusissimis subaequalibus appressis tenuiter 

 appresso-puberulis ca. 5 mm. longis ; ligulis ca. 5 patentibus late ob- 

 longis aurantiacis extus prope apicem saepe vrridi-striatulis vel reti- 

 culars minutissime puberulis et granuliferis 7.5 mm. longis 5-6.5 mm. 

 latis ; achaeniis florum liguliferorum obovatis concavo-convexis margine 

 ciliatis in summa parte bidentatis 4 mm. longis (immaturis) ; corollis 

 florum (ca. 15) disci 3 mm. longis sursum leviter ampliatis infra lirn- 

 bum brevissimum aurantiacum plus minusve purpureo-lineatis ; paleis 

 tenuibus ovato-oblongis acutis carinatis ciliolatis apice saepissime au- 

 rantiacis ; achaeniis obovatis. — Very common on grassy plains and 

 hills, Tejamen, Durango, Mexico, alt. about 2135 in., 21-27 August, 

 1906, Dr. E. Palmer, no. 500 (type, in hb. Gray). This species resem- 

 bles in many respects /,. linearis Renth. It differs, however, in having 

 broader leaves and a more slender erect and simple habit. It is espe- 

 cially to be distinguished from the related species by its fewer subequal 

 involucral scales. 

 * Cymophora Robinson, n. gen., Compositarum Helianthiearvm. 

 Capitula homogama parva cymosa ; disco parvo leviter convexo ; 

 paleis lanceolato-oblongis acutis carinatis flosculos amplectentibus. 

 Involucrum anguste campanulatum, squamis paucis ovato-oblongis 

 obtusis saepe mucronulatis subherbaceis striatis subaequalibus. Co- 

 rollae tubulosae, tubo proprio brevissimo, faucibus cylindratis, limbo 

 vel aequaliter 5-dentato vel flosculorum exteriorum plus minusve 

 irregulari sed vix radiatiformi. Antherae connatae basi obtusae vel 

 obscure sagittato-auriculatae apice distincte appendiculatae. Styli 

 rami breves recurvato-patentes filiformes graciliter et distincte appen- 

 dicular, appendicibus capillaribus rectis ca. 0.1 mm. longis. Achae- 

 nia anguste obconica pilis curvatis longiusculis albis villosa, pappo 

 nullo. — Herba annua pubescens et glandulifera ; foliis oppositis late 

 ovatis subintegris ; corollis albis ; antheris purpureis. 



C Pringlei Robinson, n. sp., caulibus laxe oppositeque ramosis 

 patente pilosis 3-4 dm. altis : ramis arcuato-curvatis vel flexuosis 



