1040 LAM1ACEAE 



very short-petioled : clusters often numerous: pedicel at least j as long as calyx : calyx 

 tubular, 6-7 mm. long ; tube hispidulous, barely if at all swollen at maturity, the lobes of 

 lower lip about twice as long as those of the upper lip : corolla pinkish, about 1 cm. long : 

 nutlets about 1.5 mm. long. 

 On prairies, Texas. Summer. 



5. Hedeoma serpyllifolia Small. Perennial, softly hirsute. Stems tufted, ascend- 

 ing or decumbent, 1-2 dm. long, considerably branched, rather woody : leaf-blades oval to 

 oblong, 5-8 mm. long, obtuse, softly pubescent, entire, manifestly petioled : clusters 2-4- 

 flowered : pedicel shorter than the calyx : calyx 5-6 mm. long, hirsute ; tube slightly con- 

 stricted above the middle, finely ribbed ; lobes subulate, the lower twice as long as the 

 upper : corolla pinkish, 5 mm. long, only slightly longer than calyx ; tube dilated above 

 the middle, minutely pubescent, the upper lip rounded, minutely notched, smaller than 

 lobes of the lower lip, its middle lobe larger than the others, deeply notched : nutlets 1 

 mm. long, puberulent. 



In dry soil, Texas. Spring. 



6. Hedeoma nana ( Torr. ) Greene. Annual or perennial, puberulent or canescent- 

 hirsute, the hairs gray. Stems erect, more or less diffusely branched, the branches stiff : 

 leaf-blades oblong to ovate, 5-12 mm. long, entire or barely toothed, nearly sessile : calyx 

 4-6 mm. long, hispidulons, surpassing the leaves, especially above ; tube swollen, consider- 

 ably so at maturity, the lobes of the lower lip between twice and thrice as long as those of 

 the upper : corolla 6-7 mm. long ; tube slender, the upper lip and middle lobe of the lower 

 lip notched, other lobes obtuse : nutlets 1.2-1.3 mm. long. [H. thymoides A. Gray.] 



On plains or prairies, Texas to Arizona. Summer. 



7. Hedeoma sancta Small. Annual or biennial, finely cinereous-pubescent. Stems 

 erect, 1-3 dm. tall, somewhat branched, rather slender : leaf-blades oval, oblong or nar- 

 rowly oblong, 1-1.5 cm. long, entire, slightly revolute, very short-petioled: calyx 5-6 

 mm. long, hispidulous, surpassed by the leaves; tube somewhat swollen, the lobes of the 

 lower lip about twice as long as those of the upper : corolla 4-5 mm. long, puberulent ; 

 tube slender, the upper lip and middle lobe of the lower lip truncate or barely emarginate, 

 the other lobes rounded : nutlets fully 1 mm. long. 



In dry soil, Texas. Spring. 



8. Hedeoma lata Small. Perennial, firm, finely hirsute. Stems 1-3 dm. tall, re- 

 peatedly branched above : leaf-blades oblong to linear-oblong, 1-1.5 cm. long, obtuse or 

 acutish* closely pubescent, sessile or nearly so : calyx 7-9 mm. long, finely hirsute ; tube 

 constricted or bent on the back near the throat ; lobes subulate, the lower about twice as 

 long as the upper : corolla 10-12 mm. long, minutely pubescent, considerably longer 

 than the calyx : nutlets fully 1 mm. long. 



On rocky prairies, Texas and New Mexico. Spring to fall. 



9. Hedeoma Reverchonii A. Gray. Perennial, rigid, finely hirsute. Stems tufted, 

 erect or ascending, 1-2 dm. tall, simple, softly pubescent : leaf-blades leathery, oblong or 

 nearly so, 5-15 mm. long, obtuse, entire, finely pubescent, very short-petioled : calyx 8-10 

 mm. long, conspicuously bristly hispid ; tube constricted on the back above the middle ; lobes 

 subulate, the lower twice as long as the upper : corolla 13-15 mm. long, minutely pubes- 

 cent, nearly twice as long as calyx ; tube gradually dilated, the upper lip ovate, slightly 

 notched, the lower lip 3-lobed, its middle lobe deeply notched : filaments and style gla- 

 brous : nutlets nearly 1.5 mm. long, granular. 



In rocky soil, middle Texas. Summer. 



26. STACHYDEOMA Small. 



Annual or perennial caulescent pubescent herbs. Leaves opposite : blades entire or 

 shallowly toothed, sessile or nearly so, the upper at least hirsute-ciliate. Flowers in ter- 

 minal continuous or slightly interrupted spike-like panicles. Bracts narrow or subulate. 

 Calyx short-pedicelled, hirsute : tube not gibbous : lobes subulate or setaceous. Corolla 

 pink or purple, the throat with a pair of longitudinal projecting folds under the lower lip- 

 Style pubescent. Nutlets nearly smooth. 



Spike-like inflorescence continuous, abbreviated : leaf-blades entire ; plants annual : Texan species. 



1. S. ciliata. 

 Spike-like inflorescence interrupted below, elongated : leaf-blades toothed : plants 



perennial : Floridian species. 2. S. graveolens. 



1. Stachydeoma ciliata (Benth. ) Small. Annual, puberulent, and hirsute above. 

 Stems 1-3 dm. tall, branching above : leaf-blades oblong to oblong-ovate, 1-2 cm. long, 

 acutish, slightly toothed, sessile : clusters aggregated into terminal panicles, 1-2 cm. long : 



