538 LIMNANTHACEAE 



puinate, glabrous; divisions 3-5, oblong or oblanceolate to nearly linear 5-15 

 mm. long; sepals ovate, 2 mm. or in fruit 3 mm. long; petals oblanceolkte or 

 oblong, usually less than 1 mm. long; carpels usually 2. Wet places: Colo.— 

 VVyo. — Calif. — Wash. ^ 



Family 71. ZYGOPHYLLACEAE. Caltrop Family. 



Perennial herbs, shrubs, or trees, with articulate stems. Leaves alter- 

 nate or opposite, digitate or evenly pinnate, with inequilateral punctate 

 leaflets. J^ lowers perfect, regular or nearly so. Sepals 5, rarely 4 or 6, 

 usually imbricate. Petals as many, hypogynous. Stamens twice as many. 

 Gynoecium of 2-5 united carpels; ovary 2-5-celled, rarely 10-12-celled, 

 angled or winged; styles wholly united. Fruit a capsule or splitting into as 

 many or twice as many nutlets as there are carpels. 



Leaves digitately 1-7-foliolate; stipules spiny; stamens with scale-like appendages. 

 Leaves abruptly pinnate; stipules in ours not spiny. *' ^"^^^^^^^ 



bUruDS with pnnnfinprm- fmn>. w^^iKr. ^+««^%.„„ ,„;... t. ._ ... 



2. COVILLEA 



Herbs wkhout endosperm; corolla mostly yellow; stamens without scale-like appen- 



^"^^LriPrt^ng,^^^^,. ^V^ abortion sometimes fewer) carpels, each with 3-5 one- 

 Fruit di^-rifn^nt^^^^'^^A ^?"'^- . 3. TRIBtJLUS. 



mPrpVv- t^,li^i J"^^ ^*'"'=^ ^ ^^"^^ =^^ *^^e original carpels) one-seeded nutlets, 



4. Kallstkoemia. 



merely tubercled. 



1. FAGONIA L. 



Branching, diffuse, spreading, or prostrate undershrubs. Stems spinulose on 

 the upper angles. Leaves opposite, digitately 1-7-foholate; leaflets entire, 

 cal ous-mucronate or spinulose-tipped; stipules often spinescent. Flo^vers 

 f,r, ,f ^'i P^^d^J'^ate. Sepals 5, imbricate, caducous. Petals 5, imbricate, 

 ungmculate, caducous. Stamens 10; filaments filiform, naked. Style subulate 



1 S^'""^*''! °''f7 !:f ll^^fi- Fruit pyramidate-ovoid, deeply 5-angled, the 

 edge carpels at length separating from the axis and dehiscing on the inner 



i- 



cf ^' J- *=flifornica Benth. A low dichotomously branched undershrub; 

 stems 2-5 dni. long, diffuse, much branched, glabrous; stipules 2-5 mm. long, 

 arcuate-spreading; leaflets 3, lanceolate or ovate-lanceolate, glabrous or nearlv 

 so, rf-10 mm. long; petals spatulate , 5-8 mm. long; fruit ovate or spindle-shaped 

 m outhne, 4-5 mm. long, 7-8 mm. broad, finely pubescent. Sandy soil: Calif.— 

 s Ltah.— Sonora— L. Calif. L. Son. 



2. COVILLEA Vail. Creosote Bush, Hediondilla. 



Low, evergreen strong-scented, b'alsamiferous shrubs. Leaves opposite, 

 consisting of a smgle pan-, rarely of several pairs of small inequilateral leaflets ; 

 pWf r'^ n "^- f ^d^^^les 1-flowerea. Sepals 5, imbricate, unequal, caducous. 

 £.mL^'ir^°'''\''S°^'^^u ''J lanceolate-spatulate, more or less uiiguiculate. 

 ?,r^^ff. 10, inserted on the base of the small disc. Anthers oblong. PistU of 5 



imited 



united 



XAV-.r V r 1-^ f. '^^^V.^™'^"™^^ separable. Fruit villose or tomentose, 

 globose, 5-angled. [Larrea Cav., not Ort.] 



1 -i^ m ' i,^^u *T^* (Engelm.) Rydb. A diffusely branched resinous shrub, 

 Wiptrnbl n„'i 1°^ TJ"^^ ^^y- ''^Sled, silky-pubescent; leaves nearly sessile; 

 lf<.nntl>, T ^ lanceolate or lunate, falcate, 5-10 mm. long, coriaceous, resinous 

 Wp I^nfJd f ^t7"^^^T-'uH^''°?S"^«P^*^^^t«' 3-ribbed; petals slightly unguic u- 

 dpn;p1^ r^f*^'°M^''°' b^/S^t yeUow; fruit subglobose or' eUiptic, 4^5 mm. broad, 

 rJ^IJ^V-?^'^- f ff^'^"«s«. Engelm. L. mexicana Torr., not Moric! 

 L Sm ' "" ^ ^^' P ^""^ ^""^ ^""^ '■ '^^''■-^ Utah— Calif . ; n Mex. 



