TESTS OF IOWA WEED SEEDS 
529 
PROTEIN CONTENT CHEMICALLY CONSIDERED. 
The samples thus far examined are given below in the order 
of their protein content. 
Common Name 
Botanical Name 
Wt. of 50 
No. seeds 
per gm. 
Per cent 
nitrogen 
Per cent 
protein j 
Sweet clover 
Melilotus alba 
.0882 
567 
5.61 
35.05 
Red clover . _ _ ___ 
Trifolium pratense — 
Yellow seed 
.0877 
570 
5.48 
34.23 
Purple seed 
.0834 
600 
5.37 
33.54 
Yellow sweet clover 
Melilotus officinalis 
.0832 
601 
5.35 
33.44 
Alsike clover 
Trifolium hybridum 
.0335 
1490 
5.24 
32.72 
Milkweed 
Asclepias syriaca 
.3214 
156 
5.00 
31.25 
White clover _ _ _ __ 
Trifolium repens 
.0270 
1850 
4.97 
31.03 
Greater ragweed 
Ambrosia trifida 
.8045 
622 
4.94 
30.89 
Rudbeckia hirta _ _ __ _ 
.0085 
5880 
4.92 
30.73 
Wild lettuce - 
jLactuca canadensis 
.0305 
1640 
2.72 
29.45 
Swamp milkweed 
Asclepias incarinata 
.0903 
5540 
4.69 
29.33 
Dandelion 
Taraxacum officinale 
.0160 
3120 
4.64 
28.98 
Dandelion _ 
erytbrospermum 
.0138 
3620 
Horse mint 
Monarda punctata 
.0241 
2070 
4.52 
28.28 
Vetch - 
Vicia fab a : 
1.2174 
41 
4.46 
27.87 
Pepper grass __ 
Lepidium virginicum 
.0112 
4460 
4.27 
26.70 
'Pumbling mustard 
Sisymbrium altissimum 
.0077 
6490 
4.01 
25.03 
Sand bur _ 
Cenchrus tribuloides - 
.3619 
138 
3.86 
24.14 
Three -seeded' mercury 
Acalypha virgirmca 
.0366 
1370 
3.85 
24.07 
Wild mustard 
Brassica arvensis 
.0905 
552 
3.80 
23.72 
Small ragweed _ 
Ambrosia artemisiaefolia_ 
.2495 
200 
3.75 
23.46 
Five-finger 
Potentilla arguta 
.0065 
7690 
3.73 
23.29 
Wild four o'clock 
Oxybaphus nyctagineus 
.1262 
396 
3.64 
22.77 
Mallow 
Malva rotundifolia 
.0656 
762 
3.61 
22.57 
Homo 
Cannabis sativa 
.4524 
111 
3.59 
22.47 
P'rickly lettuc° 
Lactuca scariola _ _ _ 
.0222 
2250 
3.49 
21.80 
Velvet leaf • 
Abutilon theophrasti 
.5002 
100 
3.35 
20.93 
Sticktight 
Bidens frondosa 
.1740 
287 
3.25^ 
20.30 
Wild morning glory __ 
Convolvulus sepium 
1.4340 
35 
3.23 
20.20 
Doorvard plantain 
Plantago major 
.0107 
4670 
3.05 
19.09 
Burdock 
Arctium lappa 
.3270 
153 
3.05 
19.06 
Heal-all 
Prunella vulgaris 
.0334 
1500 
3.03 
18.91 
Catnip 
Nepeta cataria 
.0289- 
1850 
3.00 
18.75 
Timothy 
Phleum pratense 
.0190 
2630 
2.89 
18.04 
Mullein 
Verbascmn thapsus 
.0034 
14700 
2.86 
17.86 
Spurge ______ 
Euphorbia Preslii 
. 0266 
1880 
2.85 
17.81 
Green cone flower _ ___ 
Lepaehys pinnata 
.0343 
1460 
2.80 
17^52 
Evening primrose 
Oenothera biennis 
.0147 
3400 
2.72 
16.99 
Yellow foxtail 
Setaria glauca _ 
.0549 
811 
2.65 
16.92 
Simpson honey plant 
Serophularia marila'ndica. 
.0055 
9090 
2.55 
15.’ 93 
Soap wort 
Saponaria officinalis 
.0836 
598 
2.55 
15.92 
Redroot _ 
Am a r a nth us ret r o f lexu s— 
.0166 
3010 
2.49 
15.59 
Bull thistle 
Cirsium lanceolatum 
.0923 
5420 
2.48 
15.48 
Pigweed 
Amaranthus graecizans __ 
.0176 
2840 
2.32 
14.52 
Wild parsnip 
Pastinaca sativa _ _ ___ 
.1080 
463 
2.30 
14.36 
Cinquefoil 
Potentilla inonspeliensis___ 
.0048 
10400 
2.27 
14.15 
Knot grass _ _ _ __ 
Polygonum aviculare 
.0423 
1180 
2.21 
13.85 
Yellow dock 
Rumex crisnus 
. 0678 
737 
2.14 
13.14 
False groin w 7 ell 
Lithospermum latifoliumJ 
.6S95 
. 73 
1.93 
12.04 
ITostrate pigweed 
Amaranthus blitoides 
.0441 
1130 
1.88 
11.75 
White vervain 
Verbena urticaefolia 
.0176 
2840 
1.78 
11.12 
Germander 
Teuerium canadense 
.0544 
919 
1.76 
11.03 
Hoary verain _ _ _ . 
Verbena stricta 
.0331 
1510 
1.63 
10.16 
Wild buckwheat __ 
Polygonum convolvulus __ 
'.2080 
240 
1.59 
9.94 
Erect knot weed. 
Polygonum erectum 
.0580 
862 
1.49 
9.28 
Lady’s thumb _ 
Polygonum Persicaria 
.0537 
931 
1.05 
6.56 
Smartweed 
Polygonum Pennsylvani- 
Horse gentian _ 
cum 
.1561 
320 
.91 
5.69 
Triosteum perfoliatum 
2.3260 
21 
.88 
5.51 
Prairie rose 
Rosa pratincola 
.4825 
104 
.68 
4.25 
Sumach 
Rhus glabra _____ 
.2199 
277 
.52 
3.24 
34 
