n6 PHLOX ORDER 



Solanum Linne 1753 Nightshade, Buffalo Bur 



(Lat. sola, solace, perhaps from use as medicine) 



PI. 19, fig. 4. 



Sepals 5, united into a bell- or saucer-shaped calyx, petals 5, white, 

 blue, purple or yellow, united into a saucer-shaped corolla, the lobes plaited, 

 the tube very short, stamens 5, inserted on the throat of the corolla, ovary 

 usually with 2 cavities, stigma small, berry mostly globose, the calyx either 

 persistent at the base or enclosing it ; flowers clustered ; leaves entire, 

 toothed or pinnately cut; annual or perennial. 



1. Flowers white; plants not prickly 



a. Leaves entire to pinnatifid, annuals 



(1) Leaves entire to toothed; berries black S. nigrum 



(2) Leaves pinnatifid; berries green 5\ trifiorum 



b. Leaves pinnate, of 7-9 leaflets; perennial from 



tubers 5\ Jdmesii 



2. Flowers yellow or blue ; plants prickly 



a. Flowers yellow; fruit prickly; leaves pinnatifid S. rostrdtum 



b. Flowers blue or violet, rarely white 



(1) Fruit prickly; leaves pinnatifid S. heterodoxum 



(2) Fruit smooth; leaves entire or toothed S. elaeagnifolium 



HYDROPHYLLACEAE WATERLEAF FAMILY 



Sepals 5, united, petals 5, united into a funnelform, salverform, 

 bell-shaped or saucer-shaped corolla, stamens 5, on the tube or base of 

 the corolla, ovary 2-celled, or 1-celled with 2 placentae, styles 2, separate 

 or partly united, capsule 1-2-celled ; flowers in curved cymes, spikes or 

 racemes, or rarely solitary ; herbs with alternate or basal, rarely opposite 

 leaves. 



1. Styles 2; flowers solitary in the forks of the stem Nama 



2. Style 1, 2-cleft 



a. Flowers solitary ; leaves opposite, at least the 



lower 



(1) Calyx with bracts between the sepals, not 



greatly enlarged in fruit Nemophila 



(2) Calyx without alternating bracts, greatly 



enlarged in .fruit Macrocalyx 



b. Flowers in clusters 



(1) Corolla lobes imbricate before the flower 



opens Phacelia 



(2) Corolla lobes convolute Hvdrophyllum 



