568 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



KEY TO THE SPECIES. 



Plants glaucous, more than a meter high, woody below 1. N. glauca. 



Plants densely viscid, green, less than a meter high, herbaceous 

 throughout. 



Leaves clasping at the base; flowers diurnal 2. N. trigonophylla. 



Leaves petiolate, not clasping; flowers nocturnal 3. N. attenuata. 



1. Nicotiana glauca Graham, Edinburgh Phil. Journ. 1828: 174. 1828. 

 Type locality: Cultivated from seeds received from Buenos Aires. 



Range: South America; abundantly introduced into southern North America' 

 from Texas to southern California and Mexico. 

 New Mexico: One mile south of Kingston (Metcalfe 1009). 



2. Nicotiana trigonophylla Dunal in DC. Prodr. 13 1 : 562. 1852. 

 Type locality: Aguas Calientes, Mexico. 



Range: Western Texas to southern California and southward. 



New Mexico: Fairview; Carlisle; Mangas Springs; Kingston; Dog Mountains; 

 mountains west of San Antonio; Tortugas Mountain; Organ Mountains; Tularosa; 

 Lincoln; Lakewood. Canyons, in the Lower and Upper Sonoran zones. 



3. Nicotiana attenuata Torr.; S. Wats, in King, Geol. Expl. 40th Par. 5: 276. pi. 



27./. 1. 1871. 

 Type locality: Not definitely stated. 

 Range: California to Utah and Texas. 



New Mexico: Aztec; Carrizo Mountains; Silver City; Mangas Springs; Berendo 

 Creek. Sandy plains, Upper Sonoran Zone. 



3. PETUNIA Juss. 



Diffuse prostrate annual with numerous small entire leaves and inconspicuous soli- 

 tary axillary flowers; calyx of 5 narrow sepals united only at the base; corolla funnel- 

 form, pale purplish red, about 5 mm. long; capsules ovoid, 3 to 4 mm. long, surpassed 

 by the calyx lobes. 



1. Petunia parviflora Juss. Ann. Mus. Paris 2: 216. pi. 47. 1803. 



Type locality: "De l'embouchure de la Plata." 



Range: Southern Florida to Texas and southern California; also in tropical America. 



New Mexico: Albuquerque; Mesilla Valley. Waste ground and along stream beds, 

 in the Lower Sonoran Zone. 



4. LYCIUM L. Tomatilla. 



Shrubs with divaricate branches, many of them ending in spines; leaves alternate 

 or often fascicled, thickish, entire or undulate; flowers mostly in few-flowered axillaiy 

 cymes; calyx of 5 sepals united at the base, persistent in fruit; corolla funnelform to 

 almost salverform, greenish or purplish, 5-lobed; stamens mostly exserted; ovary 2- 

 celled ; berries globose, fleshy, scarlet. 



KEY TO THE SPECIES. 



Stems slender, recurved or climbing; introduced plant 4. L. halimifolium. 



Stems stout; native plant. 



Flowers greenish, 20 mm. long; older branches dark reddish 



brown 1. L. pallidum. 



Flowers purplish, 12 mm. long or less; branches grayish. 



Corolla 8 to 12 mm. long; leaves large, numerous 2. L. torreyi. 



Corolla 5 mm. long, leaves small 3. L. parviflorum. 



