62 URTICACEAE 



Plants with subterranean stems : in pinelands. 



Leaf-blades entire: cup saucer-shaped to hemispheric; nut rounded at the apex. 



1. Q.pumila. 

 Leaf-blades (lower) plnnately toothed or lobed : cup turbinate: 



nut tapering. 2. Q. minima. 



Plants with erect stems : in hammocks. 



Cup turbinate or hemispheric : nut long : leaf-blades pale be- 

 neath, pubescent 3. Q. \-\rgii\iana. 

 Cup saucer-shaped : nut very short : leaf-blades not pale be- 

 neath, glabrous. 4. Q. myrtifolia. 



1. Q. pumila Walt. Shrub with underground stems, the branches 3-6 dm. 

 tall, or sometimes taller: leaf-blades narrowly oblong, varying to lanceolate 

 or oManceolate, 5-12 cm. long, finely tomentose beneath, entire, sometimes 

 slightly crisped: acorns sessile or nearly so; cup saucer-shaped, sometimes 

 deeply so, 12-15 mm. wide; nut ovoid, 10-15 mm. long. Pinelands. 



2. Q. minima (Sarg.) Small. Shrub with underground stems, the brandies 

 less than 1 m. tall: leaf-blades obovate, or sometimes oblong or oblanceolate 

 in outline, 3-10 cm. long, glabrous or finely pubescent beneath, repand- 

 toothed. or those of the upper leaves sometimes entire: acorns solitary or 

 several on a peduncle; cup hemispheric, about 15 mm. wide; nut ovoid or 

 elliptic, 15-18 mm. long. Pinelands. 



3. Q. virginiana Mill. Tree becoming 30 m. tall: leaf -blades oval or oblong, 

 varying to obovate or oblanceolate, 3-12 cm. long, entire, smooth; acorns 

 solitary or spicate on peduncles; cup hemispheric, 15-20 mm. wide; nut ovoid 

 or oblong-ovoid, 20-25 mm. long, twice as long as the cup. Hammocks. 

 (Cuba.) LIVE-OAK. 



4. Q. myrtifolia Willd. Shrub, or tree becoming 6 m. tall: leaf-blades 

 obovate or oval, 25 cm. long, entire, shining above, dull beneath: acorns 

 sessile or nearly so; cup saucer-shaped, 10-13 mm. wide; nut ovoid or oblong- 

 ovoid, 10-14 mm. long. Hammocks. 



Order URTICALES. 



Shrubs or trees, or herbs. Leaves alternate, or in the case of herbs 

 often opposite : blades simple, entire, toothed, or divided. Flowers various, 

 not in aments. Calyx present. Corolla wanting. Androecium often of 

 as many stamens as there are sepals. Gynoecinm of a single carpel or of 

 2 united carpels. Fruit an achene, a samara, drupe, syncnrp. or <vcomnin. 



Fruit an achene, the atbenes sometimes in the accrescent sepals and disposed In a 

 syncs rp. 



Flower* not on a receptacle : fruits not forming syncarps : sepals neither thick 



_jlng the acbenes. Fam. i. r 



Flowers on the outside or Inside of a receptacle : fruit* 



and Juicy, nor enveloping the acbenes. Fam. I. I'RTICACEAE. 



forming syncarps : sepals accrescent, enveloping the 

 achenea. l-':im. _'. Ai:n>. UIPAOAB. 



Fruit a samara or a drupe, sometimes nut-like. t i MACEAE. 



OL1 1. URTICACEAE. NKTTLK FAMILY. 



Herbs or shrubby plants (ours), often with stinging hair-. Leaf- 

 blades entire, toothed, or rarely lobed. Flowers dioecious, monoeeiou-. or 

 polygamous, cymose. Calyx of 2-5 distinct or partially united sepals. 

 Amlroorium of 2-~> stamens, (iviioerinm n single carpel. Fruit an adieup. 



Flower-clusters not tnvolucrate : leaves mostly opposite. 



Sepals of the pistillate flowers distinct or nearly so, not Investing the ncbene: 



ntlftma tufted. I. PlUU. 



Repals of the pistillate flowers united, the tube Investing tbe 



nchene : stigma elongate. 2. BOBHMBRIA. 



Flower-clusters Involucrate : leave* mostly alternate. 3. PAKIETARIA. 



I 



