112 UMBELLIFER^E. (PARSLEY FAMILY.) 



5. O. fragilis, Haw. Joints small, ovate, compressed or tumid or even 

 terete, 1 to 1 \ inches long, fragile : larger spines 4, cruciate, mostly yellowish 

 iiroivn, with 4 to 6 smaller while radiating ones below ; bristles few : flowers yel- 

 low ; fruit with 20 to 28 clusters of bristles, only the upper ones with a few 

 short spines. — From the Upper Missouri and Yellowstone to New Mexico. 



§ 2. Joints cylindrical, more or less tubercu/ated : seed not margined. 



6. O. arborescens, Eng. Arborescent, 5 to 6 feet high (much higher 

 farther south) : branches numerous, verticillate, horizontal or pendulous : 

 joints verticillate: tubercles cristate, prominent : spines 8 to 30, divaricately 

 stellate : berry sub-hemispherical, tuberculate-cristate, yellow, unarmed. — 

 Wisliz. Rep. 6. Abundant from Central Colorado southward. 



Order 35. FICOIDEjE. 



A miscellaneous group, chiefly of fleshy or succulent plants, with 

 mostly opposite loaves and no stipules; differing from Caryophyllacem 

 and PortuHucacece by having distiuct partitions to the ovary and capsule; 

 the stamens sometimes numerous, as in Cactaeece ; petals wanting in 

 ours. 



1. Sesuvium. Calyx-lobes 5, petaloid. Stamens 5 to 60. Capsule circumscissile. Suc- 



culent. 



2. Mollugo. Sepals 5. Stamens 3 or 5. Capsule 3-valved. Not succulent. 



1. SESUVIUM, L. Sea Purslane. 



Calyx-tube turbinate ; the lobes apiculate on the back near the top, mem- 

 branously margined. Styles 3 to 5. Capsule ovate-oblong. — Smooth branch- 

 ing mostly prostrate herbs : leaves opposite, linear to spatulate, entire : flowers 

 axillary and terminal, solitary or clustered. 



1. S. Port ul aeastrum, L. Leaves linear-lanceolate to oblong-lanceo- 

 late : flowers sessile or pedicellate : calyx-lobes more or less purple : stamens 

 many. — From California through Nevada and Colorado to New Mexico. 



2. M OL LUGO, L. Carpet-weed. 



Stamens hypogynous. Styles 3. Seeds longitudinally sulcate on the back. 

 — Low and much branched, glabrous : leaves spatulate to linear-oblanceolate, 

 entire, opposite and apparently verticillate : flowers mostly on long pedicels 

 and axillary. 



I. M. verticillata, L. Prostrate: pedicels umbellately fascicled at the 

 nodes : capsule oblong-ovoid : seeds reniform, shining. — From Colorado to 

 Arizona and New Mexico ; also in California and the Atlantic States. 



Order 36. BMBELUFEBjE. (Parsley Family.) 



Herbs, with small flowers in umbels, five epigynous stamens and 

 petals, and two styles ; the calyx adnate to the 2-celled ovary, which 



