398 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Capsules glabrous. 
Plants more or less pilose on the stems and leaves. 
Stems erect; leaves 2 cm. long or more............ 3. C. nutans. 
Stems prostrate; leaves usually less than lcm. long. 4. C. serrula. 
Plants glabrous, or at least never pilose. 
Stems erect or strongly ascending; plants yellowish 
QTCON 0. eee cece ee eee cee eee eee eee 6. C. neomexicana. 
Stems prostrate; plants not yellowish. 
Seeds conspicuously wrinkled horizontally....17. C. glyptosperma. 
Seeds not wrinkled, pitted or smooth. 
Seeds pitted...............200..00..0000- 18. Ce rugulosa. 
Seeds smooth or nearly s0..............-. 5. C. serpyllifolia, 
Leaf blades entire. 
Perennials, 
Leaves strongly pubescent..................220--0--- 7. C. lata. 
Leaves glabrous. 
Stems prostrate; involucres corolla-like .......... 8. C. albomarginata., 
Stems erect or ascending; involucres inconspicuous. 
Leaves scarcely if at all longer than broad, 
rounded-obtuse..................22220- 9. C. fendleri. 
Leaves twice as long as broad, acute.......... 10. C. chaetocalyx. 
Annuals. 
Stems prostrate; leaves usually very oblique at the base. 
Stipules ciliate..........-22. 2.20. c eee ee ee ee ee eee 13. C. micromera. 
Stipules not cilitate. 
Leaves about as long as broad; stipules trian- 
gular-subulate..................2.2..--- ll. C. serpens. 
Leaves twice as long as broad; stipules filiform.12. C. yeyert. 
Stems erect; leaves slightly if at all unequal at the base. 
Capsules less than 1.5 mm. broad; plants 15 cm. 
high or less; branches divaricate...........- 14. C. revoluta. 
Capsules more than 1.5 mm, broad; plants 30 cm. 
high or more; branches ascending. 
Appendages of glands conspicuous, white..... 15. C. petaloidea. 
Appendages inconspicuous, greenish white, or 
obsolete... 2.2.2... eee eee eee eee eee ee eee 16. C. flagelliformis. 
1. Chamaescyce indivisa (Engelm.) Millsp. Field Mus. Bot. 2: 387. 1914. 
Euphorbia dioica indivisa Engelm, in Torr. U. 8. & Mex. Bound. Bot. 187. 1859. 
Tyre Locauiry: Near the Copper Mines, New Mexico. Type collected by Wright 
(no. 1845). 
Rance: Western Texas and southern Arizona to Mexico. 
New Mexico: Hillsboro; Organ Mountains. Dry plains and low hills, in the 
Upper Sonoran Zone. 
2. Chamaesyce stictospora (Engelm.) Small, Fl. Southeast. U.S. 714. 1903. 
Euphorbia stictospora Engelm. in Torr. U. 8S. & Mex. Bound. Bot. 187. 1859. 
Type Locauity: ‘‘From Kansas (Fendler, 798) to Santa Fe (Fendler, 797) and 
Dofia Ana (Wright, 59), New Mexico, and Corallitas, Chihuahua.” 
Range: Kansas and Colorado to Mexico. 
New Mexico: Pecos; Fort Cummings; Kingston; Sandia Mountains; Mesilla Val- 
ley; Carrizozo; south of Roswell; Gray. Hills and plains, in the Lower and Upper 
Sonoran zones. 
