498 



CABYOPHYLLACEAE 



of the opposite pairs unequal. Flowers bright silvery-white by reason of the 

 searions ealyx-lobes, borne in dense axillary eymose c-histers. Calyx-lobes 5. 

 Petals none. Stamens 10 to 15, only 1 to 5 anther-bearing. Style bifid, in- 



■**i*"&>i' 



Fig. 9S. ACHTKONTCHIA COOPERI T. 



eluded. Utricle thin, included in the calyx.- — Species 2, California and Mexico. 

 (Greek achuron, chaff, and onyx, onjehos, a linger nail, in reference to the 

 thin shining calyx-lobes.) 



1. A. cooperi T. & G. (Figs. 98 and 99a.) Stems 2 to 5 inches long, slen- 

 der, prostrate, radiating from the crown of an annual root; leaves spatulate, 

 11 o to 9 lines long; flowers 1 line long, in conspicuous dense axillary cymes; 

 calyx-lobes scarious, their lower third fleshy-herbaceous like the urn-shaped 

 calyx-tvibe. 



Sandy washes and valleys, ]\Iohave and Colorado deserts. Lower California. 

 May. 



Logs. — Needles, Jones 3790; Salt Well, Mobave Desert, Bull if- Chandler 6S91 ; Carrizo Creek, 

 T. Brandegee; Conchilla Desert, Jepson 6053; Indian Well, HaU 5773; Split Mt., Parish 9051. 



Eef. — AcHYRONTCHiA COOPERI T. & G. Proe. Am. Acad. 7: 331 (18(58), type loe. Camp Cady 

 (near Daggett), Cooper. 



Fig. 99. a, AcHYRONYCHiA COOPERI T. & G., flower laid open. 6, Ebemolithia 

 RixPORDii Jepson; flower laid open, x 7. 



13. EREMOLITHIA Jepson nov. gen. 

 Perennial with erect stems and linear leaves. Stems arising from a woody 

 root crown crowded with scales and lacerate-fringed stipules. Flowers ses- 

 sile in small axillary 1 to 3-flowered clusters. Calyx tube 14 to Vs as long as 

 the lobes, the 5 lobes membranous with a central lanceolate green spot. Sta- 



